Data Sheet

UJA1079A
LIN core system basis chip
Rev. 2 — 31 January 2011
Product data sheet
1. General description
The UJA1079A core System Basis Chip (SBC) replaces the basic discrete components
commonly found in Electronic Control Units (ECU) with a Local Interconnect Network
(LIN) interface.
The UJA1079A supports the networking applications used to control power and sensor
peripherals by using the LIN interface as a local sub-bus.
The core SBC contains the following integrated devices:
• LIN transceiver compliant with LIN 2.1, LIN 2.0 and SAE J2602, and compatible with
LIN 1.3
• Advanced independent watchdog (UJA1079A/xx/WD versions)
• 250 mA voltage regulator for supplying a microcontroller; extendable with external
PNP transistor for increased current capability and dissipation distribution
• Serial Peripheral Interface (SPI) (full duplex)
• 2 local wake-up input ports
• Limp home output port
In addition to the advantages gained from integrating these common ECU functions in a
single package, the core SBC offers an intelligent combination of system-specific
functions such as:
• Advanced low-power concept
• Safe and controlled system start-up behavior
• Detailed status reporting on system and sub-system levels
The UJA1079A is designed to be used in combination with a microcontroller. The SBC
ensures that the microcontroller always starts up in a controlled manner.
UJA1079A
NXP Semiconductors
LIN core system basis chip
2. Features and benefits
2.1 General
„ Contains LIN ECU functions:
‹ LIN transceiver
‹ Scalable 3.3 V or 5 V voltage regulator delivering up to 250 mA for a
microcontroller and peripheral circuitry; an external PNP transistor can be
connected for better heat distribution over the PCB
‹ Watchdog with Window and Timeout modes and on-chip oscillator
‹ Serial Peripheral Interface (SPI) for communicating with the microcontroller
‹ ECU power management system
„ Designed for automotive applications:
‹ Enhanced ElectroMagnetic Compatibility (EMC) performance
‹ ±8 kV ElectroStatic Discharge (ESD) protection Human Body Model (HBM) on the
LIN bus pin and the wake-up pins
‹ ±6 kV ElectroStatic Discharge protection IEC 61000-4-2 on the LIN bus pin and the
wake-up pins
‹ ±58 V short-circuit proof LIN bus pin
‹ Battery and LIN bus pins are protected against transients in accordance with
ISO 7637-3
„ Small 6.1 mm × 11 mm HTSSOP32 package with low thermal resistance
„ Pb-free; Restriction of Hazardous Substances Directive (RoHS) and dark green
compliant
2.2 LIN transceiver
„
„
„
„
„
LIN 2.1 compliant LIN transceiver
Compliant with SAE J2602
Downward compatible with LIN 2.0 and LIN 1.3
Low slope mode for optimized EMC performance
Integrated LIN termination diode at pin DLIN
2.3 Power management
„ Wake-up via LIN or local wake-up pins with wake-up source detection
„ 2 wake-up pins:
‹ WAKE1 and WAKE2 inputs can be switched off to reduce current flow
‹ Output signal (WBIAS) to bias the wake-up pins, selectable sampling time of 16 ms
or 64 ms
„ Standby mode with very low standby current and full wake-up capability; V1 active to
maintain supply to the microcontroller
„ Sleep mode with very low sleep current and full wake-up capability
2.4 Control and diagnostic features
„ Safe and predictable behavior under all conditions
„ Programmable watchdog with independent clock source
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„
„
„
„
„
„
„
‹ Window, Timeout (with optional cyclic wake-up) and Off modes supported (with
automatic re-enable in the event of an interrupt)
16-bit Serial Peripheral Interface (SPI) for configuration, control and diagnosis
Global enable output for controlling safety-critical hardware
Limp home output (LIMP) for activating application-specific ‘limp home’ hardware in
the event of a serious system malfunction
Overtemperature shutdown
Interrupt output pin; interrupts can be individually configured to signal V1 undervoltage,
LIN/local wake-up and cyclic and power-on interrupt events
Bidirectional reset pin with variable power-on reset length to support a variety of
microcontrollers
Software-initiated system reset
2.5 Voltage regulator V1
„ Scalable voltage regulator for the microcontroller, its peripherals and additional
external transceivers
„ ±2 % accuracy
„ 3.3 V and 5 V versions available
„ Delivers up to 250 mA and can be combined with an external PNP transistor for better
heat distribution over the PCB
„ Selectable current threshold at which the external PNP transistor starts to deliver
current
„ Undervoltage warning at 90 % of nominal output voltage and undervoltage reset at
90 % or 70 % of nominal output voltage
„ Can operate at VBAT voltages down to 4.5 V (e.g. during cranking), in accordance with
ISO 7637 pulse 4/4b and ISO16750-2
„ Stable output under all conditions
3. Ordering information
Table 1.
Ordering information
Type number[1]
UJA1079ATW/5V0/WD
UJA1079ATW/3V3/WD
UJA1079ATW/5V0
Package
Name
Description
Version
HTSSOP32
plastic thermal enhanced thin shrink small outline package;
32 leads; body width 6.1 mm; lead pitch 0.65 mm; exposed die
pad
SOT549-1
UJA1079ATW/3V3
[1]
UJA1079ATW/5V0xx versions contain a 5 V regulator (V1); UJA1079ATW/3V3xx versions contain a 3.3 V regulator (V1); WD versions
contain a watchdog.
UJA1079A
Product data sheet
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4. Block diagram
UJA1079A
V1
BAT
V1
GND
V1
UV
EXT. PNP
CTRL
SCK
VEXCTRL
VEXCC
WBIAS
SDI
SDO
SCSN
SYSTEM
CONTROLLER
WAKE1
WAKE2
INTN
RSTN
WAKE
OSC
WDOFF
TEMP
EN
DLIN
BAT
LIMP
LIN
TXDL
LIN
BAT
RXDL
015aaa194
Fig 1.
Block diagram
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Product data sheet
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5. Pinning information
5.1 Pinning
i.c.
1
32 BAT
i.c.
2
31 VEXCTRL
TXDL
3
30 TEST2
V1
4
29 VEXCC
RXDL
5
28 WBIAS
RSTN
6
27 i.c.
INTN
7
26 DLIN
EN
8
SDI
9
25 LIN
UJA1079A
24 i.c.
SDO 10
23 GND
SCK 11
22 i.c.
SCSN 12
21 i.c.
i.c. 13
20 i.c.
i.c. 14
19 WAKE2
TEST1 15
18 WAKE1
WDOFF
17 LIMP
16
015aaa195
Fig 2.
Pin configuration
5.2 Pin description
Table 2.
UJA1079A
Product data sheet
Pin description
Symbol
Pin
Description
i.c.
1
internally connected; should be left floating
i.c.
2
internally connected; should be left floating
TXDL
3
LIN transmit data input
V1
4
voltage regulator output for the microcontroller (5 V or 3.3 V depending on
SBC version)
RXDL
5
LIN receive data output
RSTN
6
reset input/output to and from the microcontroller
INTN
7
interrupt output to the microcontroller
EN
8
enable output
SDI
9
SPI data input
SDO
10
SPI data output
SCK
11
SPI clock input
SCSN
12
SPI chip select input
i.c.
13
internally connected; should be left floating
i.c.
14
internally connected; should be left floating
TEST1
15
test pin; pin should be connected to ground
WDOFF
16
WDOFF pin for deactivating the watchdog
LIMP
17
limp home output
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Table 2.
Pin description …continued
Symbol
Pin
Description
WAKE1
18
local wake-up input 1
WAKE2
19
local wake-up input 2
i.c.
20
internally connected; should be left floating
i.c.
21
internally connected; should be left floating
i.c.
22
internally connected; should be left floating
GND
23
ground
i.c.
24
internally connected; should be left floating
LIN
25
LIN bus line
DLIN
26
LIN termination resistor connection
i.c.
27
internally connected; should be left floating
WBIAS
28
control pin for external wake biasing transistor
VEXCC
29
current measurement for external PNP transistor; this pin is connected to
the collector of the external PNP transistor
TEST2
30
test pin; pin should be connected to ground
VEXCTRL
31
control pin of the external PNP transistor; this pin is connected to the base
of the external PNP transistor
BAT
32
battery supply for the SBC
The exposed die pad at the bottom of the package allows for better heat dissipation from
the SBC via the printed-circuit board. The exposed die pad is not connected to any active
part of the IC and can be left floating, or can be connected to GND.
6. Functional description
The UJA1079A combines the functionality of a LIN transceiver, a voltage regulator and a
watchdog (UJA1079A/xx/WD versions) in a single, dedicated chip. It handles the
power-up and power-down functionality of the ECU and ensures advanced system
reliability. The SBC offers wake-up by bus activity, by cyclic wake-up and by the activation
of external switches. Additionally, it provides a periodic control signal for pulsed testing of
wake-up switches, allowing low-current operation even when the wake-up switches are
closed in Standby mode.
The LIN transceiver is optimized to be highly flexible with regard to bus topologies.
V1, the voltage regulator, is designed to power the ECU's microcontroller, its peripherals
and additional external transceivers. An external PNP transistor can be added to improve
heat distribution. The watchdog is clocked directly by the on-chip oscillator and can be
operated in Window, Timeout and Off modes.
6.1 System Controller
6.1.1 Introduction
The system controller manages register configuration and controls the internal functions
of the SBC. Detailed device status information is collected and presented to the
microcontroller. The system controller also provides the reset and interrupt signals.
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Product data sheet
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The system controller is a state machine. The SBC operating modes, and how transitions
between modes are triggered, are illustrated in Figure 3. These modes are discussed in
more detail in the following sections.
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from Standby or Normal
V1: OFF
limp home = LOW (active)
LIN: Off and
high resistance
watchdog: OFF
Off
VBAT below
power-on threshold Vth(det)pon
chip temperature above
OTP activation threshold Tth(act)otp
Overtemp
VBAT below
power-off threshold Vth(det)poff
(from all modes)
chip temperature below
OTP release threshold Tth(rel)otp
V1: OFF
LIN: Off and
high resistance
watchdog: OFF
INTN: HIGH
VBAT above
power-on threshold Vth(det)pon
watchdog
trigger
watchdog overflow or
V1 undervoltage
Standby
V1: ON
LIN: Lowpower/Off
watchdog: Timeout/Off
MC = 00
reset event or
MC = 00
MC = 10 or MC = 11
MC = 01 and
INTN = HIGH and
one wake-up enabled and
no wake-up pending
wake-up event if enabled
Sleep
Normal
successful
watchdog
trigger
V1: ON
LIN: Active/Lowpower
watchdog: Window/
Timeout/Off
MC = 1x
MC = 01 and
INTN = HIGH and
one wake-up enabled and
no wake-up pending
V1: OFF
LIN: Lowpower/Off
watchdog: OFF
RSTN: LOW
MC = 01
015aaa125
Fig 3.
UJA1079A system controller
UJA1079A
Product data sheet
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6.1.2 Off mode
The SBC switches to Off mode from all other modes if the battery supply drops below the
power-off detection threshold (Vth(det)poff). In Off mode, the voltage regulator is disabled
and the bus system is in a high-resistive state.
As soon as the battery supply rises above the power-on detection threshold (Vth(det)pon),
the SBC goes to Standby mode, and a system reset is executed (reset pulse width of
tw(rst), long or short; see Section 6.5.1 and Table 11).
6.1.3 Standby mode
The SBC will enter Standby mode:
• From Off mode if VBAT rises above the power-on detection threshold (Vth(det)pon)
• From Sleep mode on the occurrence of a LIN or local wake-up event
• From Overtemp mode if the chip temperature drops below the overtemperature
protection release threshold, Tth(rel)otp
• From Normal mode if bit MC is set to 00 or a system reset is performed (see
Section 6.5)
In Standby mode, V1 is switched on. The LIN transceiver will either be in a low-power
state (Lowpower mode; STBCL = 1; see Table 6) with bus wake-up detection enabled or
completely switched off (Off mode; STBCL = 0) - see Section 6.7.1. The watchdog can be
running in Timeout mode or Off mode, depending on the state of the WDOFF pin and the
setting of the watchdog mode control bit (WMC) in the WD_and_Status register (Table 4).
The SBC will exit Standby mode if:
• Normal mode is selected by setting bits MC to 10 or 11
• Sleep mode is selected by setting bits MC to 01
• The chip temperature rises above the OverTemperature Protection (OTP) activation
threshold, Tth(act)otp, causing the SBC to enter Overtemp mode
6.1.4 Normal mode
Normal mode is selected from Standby mode by setting bits MC in the Mode_Control
register (Table 5) to 10 or 11.
In Normal mode, the LIN physical layer (LIN) will be enabled (Active mode; STBCL = 0;
see Table 6) or in a low-power state (Lowpower mode; STBCL = 1) with bus wake-up
detection active.
The SBC will exit Normal mode if:
•
•
•
•
UJA1079A
Product data sheet
Standby mode is selected by setting bits MC to 00
Sleep mode is selected by setting bits MC to 01
A system reset is generated (see Section 6.1.3; the SBC will enter Standby mode)
The chip temperature rises above the OTP activation threshold, Tth(act)otp, causing the
SBC to switch to Overtemp mode
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6.1.5 Sleep mode
Sleep mode is selected from Standby mode or Normal mode by setting bits MC in the
Mode_Control register (Table 5) to 01. The SBC will enter Sleep mode providing there are
no pending interrupts (pin INTN = HIGH) or wake-up events and at least one wake-up
source is enabled (LIN or WAKE). Any attempt to enter Sleep mode while one of these
conditions has not been satisfied will result in a short reset (3.6 ms minimum pulse width;
see Section 6.5.1 and Table 11).
In Sleep mode, V1 is off and the LIN transceiver will be switched off (Off mode;
STBCL = 0; see Table 6) or in a low-power state (Lowpower mode; STBCL = 1) with bus
wake-up detection active - see Section 6.7.1). The watchdog is off and the reset pin is
LOW.
A LIN or local wake-up event will cause the SBC to switch from Sleep mode to Standby
mode, generating a (short or long; see Section 6.5.1) system reset. The value of the mode
control bits (MC) will be changed to 00 and V1 will be enabled.
6.1.6 Overtemp mode
The SBC will enter Overtemp mode from Normal mode or Standby mode when the chip
temperature exceeds the overtemperature protection activation threshold, Tth(act)otp.
In Overtemp mode, the voltage regulator is switched off and the bus system is in a
high-resistive state. When the SBC enters Overtemp mode, the RSTN pin is driven LOW
and the limp home control bit, LHC, is set so that the LIMP pin is driven LOW.
The chip temperature must drop a hysteresis level below the overtemperature shutdown
threshold before the SBC can exit Overtemp mode. After leaving Overtemp mode the
SBC enters Standby mode and a system reset is generated (reset pulse width of tw(rst),
long or short; see Section 6.5.1 and Table 11).
6.2 SPI
6.2.1 Introduction
The Serial Peripheral Interface (SPI) provides the communication link with the
microcontroller, supporting multi-slave operations. The SPI is configured for full duplex
data transfer, so status information is returned when new control data is shifted in. The
interface also offers a read-only access option, allowing registers to be read back by the
application without changing the register content.
The SPI uses four interface signals for synchronization and data transfer:
•
•
•
•
SCSN: SPI chip select; active LOW
SCK: SPI clock; default level is LOW due to low-power concept
SDI: SPI data input
SDO: SPI data output; floating when pin SCSN is HIGH
Bit sampling is performed on the falling clock edge and data is shifted on the rising clock
edge (see Figure 4).
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SCSN
SCK
02
01
03
04
15
16
sampled
SDI
SDO
X
floating
X
MSB
14
13
12
01
LSB
MSB
14
13
12
01
LSB
X
floating
015aaa205
Fig 4.
SPI timing protocol
6.2.2 Register map
The first three bits (A2, A1 and A0) of the message header define the register address.
The fourth bit (RO) defines the selected register as read/write or read only.
Table 3.
UJA1079A
Product data sheet
Register map
Address bits 15, 14 and 13
Write access bit 12 = 0
Read/Write access bits 11... 0
000
0 = read/write, 1 = read only
WD_and_Status register
001
0 = read/write, 1 = read only
Mode_Control register
010
0 = read/write, 1 = read only
Int_Control register
011
0 = read/write, 1 = read only
Int_Status register
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6.2.3 WD_and_Status register
Table 4.
Bit
WD_and_Status register
Symbol
Access Power-on Description
default
15:13 A2, A1, A0
R
000
register address
12
R/W
0
access status
RO
0: register set to read/write
1: register set to read only
11
WMC
R/W
0
watchdog mode control
0: Normal mode: watchdog in Window mode; Standby mode: watchdog in
Timeout mode
1: Normal mode: watchdog in Timeout mode; Standby mode: watchdog in
Off mode
10:8
NWP[1]
R/W
100
nominal watchdog period
000: 8 ms
001: 16 ms
010: 32 ms
011: 64 ms
100: 128 ms
101: 256 ms
110: 1024 ms
111: 4096 ms
7
WOS/SWR
R/W
-
watchdog off status/software reset
0: WDOFF pin LOW; watchdog mode determined by bit WMC
1: watchdog disabled due to HIGH level on pin WDOFF; results in software
reset
6
V1S
R
-
V1 status
0: V1 output voltage above 90 % undervoltage recovery threshold
(Vuvr; see Table 10)
1: V1 output voltage below 90 % undervoltage detection threshold
(Vuvd; see Table 10)
5
reserved
R
1
4
WLS1
R
-
wake-up 1 status
0: WAKE1 input voltage below switching threshold (Vth(sw))
1: WAKE1 input voltage above switching threshold (Vth(sw))
3
WLS2
R
-
wake-up 2 status
0: WAKE2 input voltage below switching threshold (Vth(sw))
1: WAKE2 input voltage above switching threshold (Vth(sw))
2:0
[1]
reserved
R
000
Bit NWP is set to its default value (100) after a reset.
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6.2.4 Mode_Control register
Table 5.
Mode_Control register
Bit
Symbol
Access Power-on
default
15:13
A2, A1, A0 R
001
register address
12
RO
0
access status
R/W
Description
0: register set to read/write
1: register set to read only
11:10
MC
R/W
00
mode control
00: Standby mode
01: Sleep mode
10: Normal mode
11: Normal mode
LHWC[1]
9
R/W
1
limp home warning control
0: no limp home warning
1: limp home warning is set; next reset will activate LIMP output
LHC[2]
8
R/W
0
limp home control
0: LIMP pin set floating
1: LIMP pin driven LOW
7
ENC
R/W
0
enable control
0: EN pin driven LOW
1: EN pin driven HIGH in Normal mode
6
LSC
R/W
0
LIN slope control
0: normal slope, 20 kbit/s
1: low slope, 10.4 kbit/s
5
WBC
R/W
0
wake bias control
0: pin WBIAS floating if WSEn = 0; 16 ms sampling if WSEn = 1
1: pin WBIAS LOW if WSEn = 0; 64 ms sampling if WSEn = 1
4
PDC
R/W
0
power distribution control
0: V1 threshold current for activating the external PNP transistor; load current
rising; Ith(act)PNP = 85 mA; V1 threshold current for deactivating the external
PNP transistor; load current falling; Ith(deact)PNP = 50 mA; see Figure 7
1: V1 threshold current for activating the external PNP transistor; load current
rising; Ith(act)PNP = 50 mA; V1 threshold current for deactivating the external
PNP transistor; load current falling; Ith(deact)PNP = 15 mA; see Figure 7
3:0
reserved
R
0000
[1]
Bit LHWC is set to 1 after a reset.
[2]
Bit LHC is set to 1 after a reset, if LHWC was set to 1 prior to the reset.
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6.2.5 Int_Control register
Table 6.
Int_Control register
Bit
Symbol
Access Power-on
default
15:13
A2, A1, A0 R
010
register address
12
RO
0
access status
R/W
Description
0: register set to read/write
1: register set to read only
11
V1UIE
R/W
0
V1 undervoltage interrupt enable
0: V1 undervoltage warning interrupts cannot be requested
1: V1 undervoltage warning interrupts can be requested
10
reserved
R
0
9
STBCL
R/W
0
LIN standby control
0: When the SBC is in Normal mode (MC = 1x):
LIN is in Active mode. The wake-up flag (visible on RXDL) is cleared
regardless of the value of VBAT.
When the SBC is in Standby/Sleep mode (MC = 0x):
LIN is in Off mode. Bus wake-up detection is disabled. LIN wake-up
interrupts cannot be requested.
1: LIN is in Lowpower mode with bus wake-up detection enabled, regardless
of the SBC mode (MC = xx). LIN wake-up interrupts can be requested.
8
reserved
R
0
7:6
WIC1
R/W
00
wake-up interrupt 1 control
00: wake-up interrupt 1 disabled
01: wake-up interrupt 1 on rising edge
10: wake-up interrupt 1 on falling edge
11: wake-up interrupt 1 on both edges
5:4
WIC2
R/W
00
wake-up interrupt 2 control
00: wake-up interrupt 2 disabled
01: wake-up interrupt 2 on rising edge
10: wake-up interrupt 2 on falling edge
11: wake-up interrupt 2 on both edges
3
reserved
R
0
2
RTHC
R/W
0
reset threshold control
0: The reset threshold is set to the 90 % V1 undervoltage detection voltage
(Vuvd; see Table 10)
1: The reset threshold is set to the 70 % V1 undervoltage detection voltage
(Vuvd; see Table 10)
1
WSE1
R/W
0
WAKE1 sample enable
0: sampling continuously
1: sampling of WAKE1 is synchronized with WBIAS (sample rate controlled
by WBC)
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Table 6.
Int_Control register …continued
Bit
Symbol
Access Power-on
default
Description
0
WSE2
R/W
WAKE2 sample enable
0
0: sampling continuously
1: sampling of WAKE1 is synchronized with WBIAS (sample rate controlled
by WBC)
6.2.6 Int_Status register
Int_Status register[1]
Table 7.
Bit
Symbol
Access Power-on
default
15:13
A2, A1, A0 R
011
register address
12
RO
0
access status
R/W
Description
0: register set to read/write
1: register set to read only
11
V1UI
R/W
0
V1 undervoltage interrupts
0: no V1 undervoltage warning interrupt pending
1: V1 undervoltage warning interrupt pending
10
reserved
R
0
9
LWI
R/W
0
LIN wake-up interrupt
0: no LIN wake-up interrupt pending
1: LIN wake-up interrupt pending
8
reserved
R
0
7
CI
R/W
0
cyclic interrupt
0: no cyclic interrupt pending
1: cyclic interrupt pending
6
WI1
R/W
0
wake-up interrupt 1
0: no wake-up interrupt 1 pending
1: wake-up interrupt 1 pending
5
POSI
R/W
1
power-on status interrupt
0: no power-on interrupt pending
1: power-on interrupt pending
4
WI2
R/W
0
wake-up interrupt 2
0: no wake-up interrupt 2 pending
1: wake-up interrupt 2 pending
3:0
[1]
reserved
R
0000
An interrupt can be cleared by writing 1 to the relevant bit in the Int_Status register.
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6.3 On-chip oscillator
The on-chip oscillator provides the timing reference for the on-chip watchdog and the
internal timers. The on-chip oscillator is supplied by an internal supply that is connected to
VBAT and is independent of V1.
6.4 Watchdog (UJA1079A/xx/WD versions)
Three watchdog modes are supported: Window, Timeout and Off. The watchdog period is
programmed via the NWP control bits in the WD_and_Status register (see Table 4). The
default watchdog period is 128 ms.
A watchdog trigger event is any write access to the WD_and_Status register. When the
watchdog is triggered, the watchdog timer is reset.
In watchdog Window mode, a watchdog trigger event within a closed watchdog window
(i.e. the first half of the window before ttrig(wd)1) will generate an SBC reset. If the watchdog
is triggered before the watchdog timer overflows in Timeout or Window mode, or within
the open watchdog window (after ttrig(wd)1 but before ttrig(wd)2), the timer restarts
immediately.
The following watchdog events result in an immediate system reset:
•
•
•
•
•
the watchdog overflows in Window mode
the watchdog is triggered in the first half of the watchdog period in Window mode
the watchdog overflows in Timeout mode while a cyclic interrupt (CI) is pending
the state of the WDOFF pin changes in Normal mode or Standby mode
the watchdog mode control bit (WMC) changes state in Normal mode
After a watchdog reset (short reset; see Section 6.5.1 and Table 11), the default watchdog
period is selected (NWP = 100). The watchdog can be switched off completely by forcing
pin WDOFF HIGH. The watchdog can also be switched off by setting bit WMC to 1 in
Standby mode. If the watchdog was turned off by setting WMC, any pending interrupt will
re-enable it.
Note that the state of bit WMC cannot be changed in Standby mode if an interrupt is
pending. Any attempt to change WMC when an interrupt is pending will be ignored.
6.4.1 Watchdog Window behavior
The watchdog runs continuously in Window mode.
If the watchdog overflows, or is triggered in the first half of the watchdog period (less than
ttrig(wd)1 after the start of the watchdog period), a system reset will be performed.
Watchdog overflow occurs if the watchdog is not triggered within ttrig(wd)2 after the start of
the watchdog period.
If the watchdog is triggered in the second half of the watchdog period (at least ttrig(wd)1, but
not more than ttrig(wd)2, after the start of the watchdog period), the watchdog will be reset.
The watchdog is in Window mode when pin WDOFF is LOW, the SBC is in Normal mode
and the watchdog mode control bit (WMC) is set to 0.
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6.4.2 Watchdog Timeout behavior
The watchdog runs continuously in Timeout mode. It can be reset at any time by a
watchdog trigger. If the watchdog overflows, the CI bit is set. If a CI is already pending, a
system reset is performed.
The watchdog is in Timeout mode when pin WDOFF is LOW and:
• the SBC is in Standby mode and bit WMC = 0 or
• the SBC is in Normal mode and bit WMC = 1
6.4.3 Watchdog Off behavior
The watchdog is disabled in this state.
The watchdog is in Off mode when:
• the SBC is in Off, Overtemp or Sleep modes
• the SBC is in Standby mode and bit WMC = 1
• the SBC is in any mode and the WDOFF pin is HIGH
6.5 System reset
The following events will cause the SBC to perform a system reset:
• V1 undervoltage (reset pulse length selected via external pull-up resistor on RSTN
pin)
•
•
•
•
•
•
•
•
An external reset (pin RSTN forced LOW)
Watchdog overflow (Window mode)
Watchdog overflow in Timeout mode with CI pending
Watchdog triggered too early in Window mode
WMC value changed in Normal mode
WDOFF pin state changed
SBC goes to Sleep mode (MC set to 01; see Table 5) while pin INTN is driven LOW
SBC goes to Sleep mode (MC set to 01; see Table 5) while
STBCL = WIC1 = WIC2 = 0
• SBC goes to Sleep mode (MC set to 01; see Table 5) while wake-up pending
• Software reset (SWR = 1)
• SBC leaves Overtemp mode (reset pulse length selected via external pull-up resistor
on RSTN pin)
A watchdog overflow in Timeout mode requests a CI, if a CI is not already pending.
The UJA1079A provides three signals for dealing with reset events:
• RSTN pin input/output for performing a global ECU system reset or forcing an
external reset
• EN pin, a fail-safe global enable output
• LIMP pin, a fail-safe limp home output
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6.5.1 RSTN pin
A system reset is triggered if the bidirectional RSTN pin is forced LOW for at least tfltr by
the microcontroller (external reset). A reset pulse is output on pin RSTN by the SBC when
a system reset is triggered internally.
The reset pulse width (tw(rst)) is selectable (short or long) if the system reset was
generated by a V1 undervoltage event (see Section 6.6.2) or by the SBC leaving Off
(VBAT > Vth(det)pon) or Overtemp (temperature < Tth(rel)otp) modes. A short reset pulse is
selected by connecting a 900 Ω ±10 % resistor between pins RSTN and V1. If a resistor is
not connected, the reset pulse will be long (see Table 11).
In all other cases (e.g. watchdog-related reset events) the reset pulse length will be short.
6.5.2 EN output
The EN pin can be used to control external hardware, such as power components, or as a
general-purpose output when the system is running properly.
In Normal and Standby modes, the microcontroller can set the EN control bit (bit ENC in
the Mode_Control register; see Table 5) via the SPI interface. Pin EN will be HIGH when
ENC = 1 and MC = 10 or 11. A reset event will cause pin EN to go LOW. EN pin behavior
is illustrated in Figure 5.
mode
STANDBY
NORMAL
STANDBY
ENC
EN
RSTN
015aaa074
Fig 5.
Behavior of EN pin
6.5.3 LIMP output
The LIMP pin can be used to enable the so called ‘limp home’ hardware in the event of an
ECU failure. Detectable failure conditions include SBC overtemperature events, loss of
watchdog service, pins RSTN or V1 clamped LOW and user-initiated or external reset
events.
The LIMP pin is a battery-related, active-LOW, open-drain output.
A system reset will cause the limp home warning control bit (bit LHWC in the
Mode_Control register; see Table 5) to be set. If LHWC is already set when the system
reset is generated, bit LHC will be set which will force the LIMP pin LOW. The application
should clear LHWC after each reset event to ensure the LIMP output is not activated
during normal operation.
In Overtemp mode, bit LHC is always set and, consequently, the LIMP output is always
active. If the application manages to recover from the event that activated the LIMP
output, LHC can be cleared to deactivate the LIMP output.
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6.6 Power supplies
6.6.1 Battery pin (BAT)
The SBC contains a single supply pin, BAT. An external diode is needed in series to
protect the device against negative voltages. The operating range is from 4.5 V to 28 V.
The SBC can handle maximum voltages up to 40 V.
If the voltage on pin BAT falls below the power-off detection threshold, Vth(det)poff, the SBC
immediately enters Off mode, which means that the voltage regulator and the internal
logic are shut down. The SBC leaves Off mode for Standby mode as soon as the voltage
rises above the power-on detection threshold, Vth(det)pon. The POSI bit in the Int_Status
register is set to 1 when the SBC leaves Off mode.
6.6.2 Voltage regulator V1
Voltage regulator V1 is intended to supply the microcontroller, its periphery and additional
transceivers. V1 is supplied by pin BAT and delivers up to 250 mA at 3.3 V or 5 V
(depending on the UJA1079A version).
To prevent the device overheating at high ambient temperatures or high average currents,
an external PNP transistor can be connected as illustrated in Figure 6. In this
configuration, the power dissipation is distributed between the SBC and the PNP
transistor. Bit PDC in the Mode_Control register (Table 5) is used to regulate how the
power dissipation is distributed. If PDC = 0, the PNP transistor will be activated when the
load current reaches 85 mA (50 mA if PDC = 1) at Tvj = 150 °C. V1 will continue to deliver
85 mA while the transistor delivers the additional load current (see Figure 7 and Figure 8).
VEXCTRL
battery
VEXCC
UJA1079A
BAT
V1
015aaa196
Fig 6.
UJA1079A
Product data sheet
External PNP transistor control circuit
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250 mA
215 mA
85 mA
50 mA
load
current
Ith(act)PNP = 85 mA
(PDC = 0)
Ith(deact)PNP = 50 mA
(PDC = 0)
IV1
165 mA
PNP
current
015aaa111
Fig 7.
V1 and PNP currents at a slow ramping load current of 250 mA (PDC = 0)
Figure 7 illustrates how V1 and the PNP transistor combine to supply a slow ramping load
current of 250 mA with PDC = 0. Any additional load current requirement will be supplied
by the PNP transistor, up to its current limit. If the load current continues to rise, IV1 will
increase above the selected PDC threshold (to a maximum of 250 mA).
For a fast ramping load current, V1 will deliver the required load current (to a maximum of
250 mA) until the PNP transistor has switched on. Once the transistor has been activated,
V1 will deliver 85 mA (PDC = 0) with the transistor contributing the balance of the load
current (see Figure 8).
250 mA
load
current
250 mA
Ith(act)PNP = 85 mA
(PDC = 0)
IV1 0 mA
−165 mA
165 mA
PNP
current
015aaa075
Fig 8.
UJA1079A
Product data sheet
V1 and PNP currents at a fast ramping load current of 250 mA (PDC = 0)
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For short-circuit protection, a resistor needs to be connected between pins V1 and
VEXCC to allow the current to be monitored. This resistor limits the current delivered by
the external transistor. If the voltage difference between pins VEXCC and V1 reaches
Vth(act)Ilim, the PNP current limiting activation threshold voltage, the transistor current will
not increase further.
The thermal performance of the transistor needs to be considered when calculating the
value of this resistor. A 3.3 Ω resistor was used with the BCP52-16 (NXP Semiconductors)
employed during testing. Note that the selection of the transistor is not critical. In general,
any PNP transistor with a current amplification factor (β) of between 60 and 500 can be
used.
If an external PNP transistor is not used, pin VEXCC must be connected to V1 while pin
VEXCTRL can be left open.
One advantage of this scalable voltage regulator concept is that there are no PCB layout
restrictions when using the external PNP. The distance between the UJA1079A and the
external PNP doesn’t affect the stability of the regulator loop because the loop is realized
within the UJA1079A. Therefore, it is recommended that the distance between the
UJA1079A and PNP transistor be maximized for optimal thermal distribution.
The output voltage on V1 is monitored continuously and a system reset signal is
generated if an undervoltage event occurs. A system reset is generated if the voltage on
V1 falls below the undervoltage detection voltage (Vuvd; see Table 10). The reset
threshold (90 % or 70 % of the nominal value) is set via the Reset Threshold Control bit
(RTHC) in the Int_Control register (Table 6). In addition, an undervoltage warning (a V1UI
interrupt) will be generated at 90 % of the nominal output voltage. The status of V1 can be
read via bit V1S in the WD_and_Status register (Table 4).
6.7 LIN transceiver
The analog sections of the UJA1079A LIN transceiver are derived from those integrated
into the TJA1021. Unlike the TJA1021 however, the UJA1079A does not include an
internal slave termination resistor. Therefore, external termination resistors need to be
connected in both master and slave applications (see Figure 9 and Figure 10).
The transceiver is the interface between the LIN master/slave protocol controller and the
physical bus in a LIN. It is primarily intended for in-vehicle sub-networks using baud rates
from 1 kBd up to 20 kBd and is LIN 2.0/LIN 2.1/SAE J2602 compliant.
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UJA1079A
UJA1079A
BAT
BAT
to supply
DLIN
LIN
to supply
DLIN
Rmaster
1 kΩ
LIN
LIN wire
Rslave
30 kΩ
LIN wire
Cslave
Cmaster
GND
GND
015aaa235
Fig 9.
Typical master application
015aaa236
Fig 10. Typical slave application
6.7.1 LIN operating modes
6.7.1.1
Active mode
The LIN transceiver will be in Active mode when:
• the SBC is in Normal mode (MC = 10 or 11) and
• the transceiver is enabled (STBCL = 0; see Table 6) and
• the battery voltage (VBAT) is above the LIN undervoltage recovery threshold, Vuvr(LIN).
In LIN Active mode, the transceiver can transmit and receive data via the LIN bus pin.
The receiver detects data streams on the LIN bus pin (LIN) and transfers them to the
microcontroller via pin RXDL (see Figure 1) - LIN recessive is represented by a HIGH
level on pin RXDL, LIN dominant by a LOW level.
The transmit data streams of the protocol controller at the TXDL input are converted by
the transmitter into bus signals with optimized slew rate and wave shaping to minimize
Electromagnetic Emissions (EME).
6.7.1.2
Lowpower/Off modes
The LIN transceiver will be in Lowpower mode with bus wake-up detection enabled if bit
STBCL = 1 (see Table 6). The LIN transceiver can be woken up remotely via pin LIN in
Lowpower mode.
When the SBC is in Standby mode or Sleep mode (MC = 00 or 01), the LIN transceiver
will be in Off mode if bit STBCL = 0. The LIN transceiver is powered down completely in
Off mode to minimize quiescent current consumption.
Filters at the receiver inputs prevent unwanted wake-up events due to automotive
transients or Electromagnetic Interferance (EMI).
The wake-up event must remain valid for at least the minimum dominant bus time for
wake-up of the LIN transceiver, twake(busdom)min (see Table 11).
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6.7.2 Fail-safe features
6.7.2.1
General fail-safe features
The following fail-safe features have been implemented:
• Pin TXDL has an internal pull-up towards VV1 to guarantee safe, defined states if
these pins are left floating
• The current of the transmitter output stage is limited in order to protect the transmitter
against short circuits to pin BAT
• A loss of power (pins BAT and GND) has no impact on the bus lines or on the
microcontroller. There will be no reverse currents from the bus.
6.7.2.2
TXDL dominant time-out function
A TXDL dominant time-out timer circuit prevents the bus lines being driven to a permanent
dominant state (blocking all network communications) if pin TXDL is forced permanently
LOW by a hardware and/or software application failure. The timer is triggered by a
negative edge on the TXDL pin. If the pin remains LOW for longer than the TXDL
dominant time-out time (tto(dom)TXDL), the transmitter is disabled, driving the bus lines to a
recessive state. The timer is reset by a positive edge on the TXDL pin.
6.8 Local wake-up input
The SBC provides 2 local wake-up pins (WAKE1 and WAKE2). The edge sensitivity
(falling, rising or both) of the wake-up pins can be configured independently via the WIC1
and WIC2 bits in the Int_Control register Table 6). These bits can also be used to disable
wake-up via the wake-up pins. When wake-up is enabled, a valid wake-up event on either
of these pins will cause a wake-up interrupt to be generated in Standby mode or Normal
mode. If the SBC is in Sleep mode when the wake-up event occurs, it will wake up and
enter Standby mode. The status of the wake-up pins can be read via the wake-up level
status bits (WLS1 and WLS2) in the WD_and_Status register (Table 4).
Note that bits WLS1 and WLS2 are only active when at least one of the wake up interrupts
is enabled (WIC1 ≠ 00 or WIC2 ≠ 00).
enable bias
disable bias
WBIASI
(internal)
WBIAS pin
WAKEx pin
Wake-up int
disable bias
wake level latched
015aaa078
Fig 11. Wake-up pin sampling synchronized with WBIAS signal
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The sampling of the wake-up pins can be synchronized with the WBIAS signal by setting
bits WSE1 and WSE2 in the Int_Control register to 1 (if WSEx = 0, wake-up pins are
sampled continuously). The sampling will be performed on the rising edge of WBIAS (see
Figure 11). The sampling time, 16 ms or 64 ms, is selected via the Wake Bias Control bit
(WBC) in the Mode_Control register.
Figure 12 shows a typical circuit for implementing cyclic sampling of the wake-up inputs.
UJA1079A
BAT
47 kΩ
WBIAS
PDTA144E
47 kΩ
biasing of
switches
WAKE1
t
WAKE2
sample of
WAKEx
GND
sample of
WAKEx
sample of
WAKEx
015aaa197
Fig 12. Typical application for cyclic sampling of wake-up signals
6.9 Interrupt output
Pin INTN is an active-LOW, open-drain interrupt output. It is driven LOW when at least
one interrupt is pending. An interrupt can be cleared by writing 1 to the corresponding bit
in the Int_Status register (Table 7). Clearing bit LWI in Standby mode only clears the
interrupt status bit and not the pending wake-up. The pending wake-up is cleared on
entering Normal mode and when the corresponding standby control bit (STBCL) is 0.
On devices that contain a watchdog, the CI is enabled when the watchdog switches to
Timeout mode while the SBC is in Standby mode or Normal mode (provided pin
WDOFF = LOW). A CI is generated if the watchdog overflows in Timeout mode.
The CI is provided to alert the microcontroller when the watchdog overflows in Timeout
mode. The CI will wake up the microcontroller from a μC standby mode. After polling the
Int_Status register, the microcontroller will be aware that the application is in cyclic wake
up mode. It can then perform some checks on LIN before returning to the μC standby
mode.
6.10 Temperature protection
The temperature of the SBC chip is monitored in Normal and Standby modes. If the
temperature is too high, the SBC will go to Overtemp mode, where the RSTN pin is driven
LOW and limp home is activated. In addition, the voltage regulator and the LIN transmitter
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are switched off (see also Section 6.1.6 “Overtemp mode”). When the temperature falls
below the temperature shutdown threshold, the SBC will go into the Standby mode. The
temperature shutdown threshold is between 165 °C and 200 °C.
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7. Limiting values
Table 8.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Conditions
Vx
voltage on pin x
DC value
Unit
pins V1 and INTN
−0.3
7
V
−0.3
VV1 + 0.3
V
pin VEXCC
VV1 − 0.3
VV1 + 0.35 V
pins WAKE1, WAKE2, WBIAS and LIN;
with respect to any other pin
−58
+58
V
pin LIMP and BAT
−0.3
+40
V
pin VEXCTRL
−0.3
VBAT + 0.3
V
pin DLIN; with respect to any other pin
reverse current from VV1 ≤ 5 V
pin V1 to pin BAT
IDLIN
current on pin DLIN
transient voltage
Max
pins EN, SDI, SDO, SCK, SCSN, TXDL, RXDL,
RSTN and WDOFF
IR(V1-BAT)
Vtrt
Min
[1]
[2]
on pins
VBAT − 0.3 +58
V
-
250
mA
−65
0
mA
−150
+100
V
−6
+6
kV
−8
+8
kV
BAT: via reverse polarity diode/capacitor
LIN: coupling via 1 nF capacitor
DLIN, WAKE1, WAKE2: via 1 kΩ series resistor
VESD
electrostatic
discharge voltage
[3]
IEC 61000-4-2
pins BAT with capacitor and LIN; via a series
resistor on pins DLIN, WAKE1, WAKE2, LIMP and
WBIAS; via transistor on pin VEXCTRL
[4]
[5]
HBM
pins LIN, DLIN, WAKE1 and WAKE2
[6]
pin BAT; referenced to ground
−4
+4
kV
pin TEST2; referenced to pin BAT
−1.25
+2
kV
pin TEST2; referenced to other reference pins
−2
+2
kV
−2
+2
kV
−300
+300
V
−750
+750
V
−500
+500
V
−40
+150
°C
−55
+150
°C
any other pin
[7]
MM
any pin
[8]
CDM
corner pins
any other pin
Tvj
virtual junction
temperature
Tstg
storage temperature
UJA1079A
Product data sheet
[9]
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Table 8.
Limiting values …continued
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Tamb
ambient
temperature
Conditions
Min
Max
Unit
−40
+125
°C
[1]
A reverse diode connected between V1 (anode) and BAT (cathode) limits the voltage drop voltage from V1(+) to BAT (−).
[2]
Verified by an external test house to ensure pins can withstand ISO 7637 part 2 automotive transient test pulses 1, 2a, 3a and 3b.
[3]
IEC 61000-4-2 (150 pF, 330 Ω).
[4]
ESD performance according to IEC 61000-4-2 (150 pF, 330 Ω) has been verified by an external test house for pins BAT, LIN, WAKE1
and WAKE2. The result is equal to or better than ±6 kV.
[5]
Human Body Model (HBM): according to AEC-Q100-002 (100 pF, 1.5 kΩ).
[6]
V1 and BAT connected to GND, emulating application circuit.
[7]
Machine Model (MM): according to AEC-Q100-003 (200 pF, 0.75 μH, 10 Ω).
[8]
Charged Device Model (CDM): according to AEC-Q100-011 (field Induced charge; 4 pF).
[9]
In accordance with IEC 60747-1. An alternative definition of virtual junction temperature is: Tvj = Tamb + P × Rth(vj-a), where Rth(vj-a) is a
fixed value to be used for the calculation of Tvj. The rating for Tvj limits the allowable combinations of power dissipation (P) and ambient
temperature (Tamb).
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8. Thermal characteristics
optional heatsink top layer
PCB copper area:
(bottom layer)
2 cm2
optional heatsink top layer
optional heatsink top layer
PCB copper area:
(bottom layer)
8 cm2
015aaa137
Layout conditions for Rth(j-a) measurements: board finish thickness 1.6 mm ±10 %, board double
layer, board dimensions 129 mm × 60 mm, board material FR4, Cu thickness 0.070 mm, thermal
via separation 1.2 mm, thermal via diameter 0.3 mm ±0.08 mm, Cu thickness on vias 0.025 mm.
Optional heat sink top layer of 3.5 mm × 25 mm will reduce thermal resistance (see Figure 14).
Fig 13. HTSSOP PCB
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015aaa138
90
Rth(j-a)
(K/W)
70
without heatsink top layer
50
with heatsink top layer
30
0
2
4
6
8
PCB Cu heatsink area (cm2)
10
Fig 14. HTSSOP32 thermal resistance junction to ambient as a function of PCB copper
area
Table 9.
Thermal characteristics
Symbol
Parameter
Rth(j-a)
UJA1079A
Product data sheet
Conditions
thermal resistance from junction to
ambient
Typ
Unit
single-layer board
[1]
78
K/W
four-layer board
[2]
36
K/W
[1]
According to JEDEC JESD51-2 and JESD51-3 at natural convection on 1s board.
[2]
According to JEDEC JESD51-2, JESD51-5 and JESD51-7 at natural convection on 2s2p board. Board with
two inner copper layers (thickness: 35 μm) and thermal via array under the exposed pad connected to the
first inner copper layer.
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9. Static characteristics
Table 10. Static characteristics
Tvj = −40 °C to +150 °C; VBAT = 4.5 V to 28 V; VBAT > VV1; RLIN = 500 Ω; all voltages are defined with respect to ground;
positive currents flow in the IC; typical values are given at VBAT = 14 V; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
4.5
-
28
V
Supply; pin BAT
VBAT
battery supply voltage
IBAT
battery supply current
MC = 00 (Standby; V1 on)
STBCL = 1 (LIN wake-up enabled)
WIC1 = WIC2 = 11 (WAKE interrupts
enabled); 7.5 V < VBAT < 28 V
IV1 = 0 mA; VRSTN = VSCSN = VV1
VTXDL = VV1; VSDI = VSCK = 0 V
Tvj = −40 °C
-
75
89
μA
Tvj = 25 °C
-
68
80
μA
Tvj = 150 °C
-
62
73
μA
MC = 01 (Sleep; V1 off)
STBCL = 1 (LIN wake-up enabled)
WIC1 = WIC2 = 11 (WAKE interrupts
enabled); 7.5 V < VBAT < 28 V
VV1 = 0 V
IBAT(add)
additional battery supply
current
Tvj = −40 °C
-
53
62
μA
Tvj = 25 °C
-
49
57
μA
Tvj = 150 °C
-
45
51
μA
contributed by LIN wake-up receiver
STBCL = 1
VLIN = VBAT; 5.5 V < VBAT < 28 V
-
1.1
2
μA
contributed by WAKEx pin edge
detectors; WIC1 = WIC2 = 11
VWAKE1 = VWAKE2 = VBAT
0
5
10
μA
5.1 V < VBAT < 7.5 V
-
-
50
μA
4.5 V < VBAT < 5.1 V
V1 on (5 V version)
-
-
3
mA
LIN Active mode (recessive)
STBCL = 0; MC = 1x
VTXDL= VV1; IDLIN = ILIN = 0 mA
5.5 V < VBAT < 28 V
-
-
1300
μA
LIN Active mode (dominant)
STBCL = 0; MC = 1x
VTXDL = 0 V; IDLIN = ILIN = 0 mA
VBAT = 14 V
-
-
5
mA
LIN Active mode (dominant)
STBCL = 0; MC = 1x
VTXDL= 0 V; IDLIN = ILIN = 0 mA
VBAT = 28 V
-
-
10
mA
Vth(det)pon
power-on detection threshold
voltage
4.5
-
5.5
V
Vth(det)poff
power-off detection threshold
voltage
4.25
-
4.5
V
UJA1079A
Product data sheet
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30 of 46
UJA1079A
NXP Semiconductors
LIN core system basis chip
Table 10. Static characteristics …continued
Tvj = −40 °C to +150 °C; VBAT = 4.5 V to 28 V; VBAT > VV1; RLIN = 500 Ω; all voltages are defined with respect to ground;
positive currents flow in the IC; typical values are given at VBAT = 14 V; unless otherwise specified.
Symbol
Parameter
Vhys(det)pon
Conditions
Min
Typ
Max
Unit
power-on detection hysteresis
voltage
200
-
-
mV
Vuvd(LIN)
LIN undervoltage detection
voltage
5
-
5.3
V
Vuvr(LIN)
LIN undervoltage recovery
voltage
5
-
5.5
V
Vhys(uvd)LIN
LIN undervoltage detection
hysteresis voltage
25
-
300
mV
Vuvd(ctrl)Iext
external current control
undervoltage detection
voltage
5.9
-
7.5
V
VO(V1)nom = 5 V; VBAT = 5.5 V to 28 V
IV1 = −200 mA to −5 mA
4.9
5
5.1
V
VO(V1)nom = 5 V; VBAT = 5.5 V to 28 V
4.75
5
5.1
V
4.5
5
5.1
V
4.85
5
5.1
V
3.234
3.3
3.366
V
2.97
3.3
3.366
V
-
-
3
Ω
4.5
-
4.75
V
Voltage source; pin V1
VO
output voltage
IV1 = −250 mA to −200 mA
VO(V1)nom = 5 V; VBAT = 5.5 V to 5.75 V
IV1 = −250 mA to −5 mA
150 °C < Tvj < 200 °C
VO(V1)nom = 5 V; VBAT = 5.75 V to 28 V
IV1 = −250 mA to −5 mA
150 °C < Tvj < 200 °C
VO(V1)nom = 3.3 V; VBAT = 4.5 V to 28 V
IV1 = −250 mA to −5 mA
VO(V1)nom = 3.3 V; VBAT = 4.5 V to 28 V
IV1 = −250 mA to −5 mA
150 °C < Tvj < 200 °C
R(BAT-V1)
Vuvd
Vuvr
IO(sc)
resistance between pin BAT
and pin V1
VO(V1)nom = 5 V; VBAT = 4.5 V to 5.5 V
undervoltage detection
voltage
90 %; VO(V1)nom = 5 V; RTHC = 0
IV1 = −250 mA to −5 mA
regulator in saturation
90 %; VO(V1)nom = 3.3 V; RTHC = 0
2.97
-
3.135
V
70 %; VO(V1)nom = 5 V; RTHC = 1
3.5
-
3.75
V
undervoltage recovery
voltage
90 %; VO(V1)nom = 5 V
4.56
-
4.9
V
90 %; VO(V1)nom = 3.3 V
3.025
-
3.234
V
short-circuit output current
IVEXCC = 0 mA
−600
-
−250
mA
voltage variation on pin V1
as a function of load current variation
VBAT = 5.75 V to 28 V
IV1 = −250 mA to −5 mA
-
-
25
mV
voltage variation on pin V1
as a function of supply voltage variation
VBAT = 5.5 V to 28 V; IV1 = −30 mA
-
-
25
mV
Load regulation
ΔVV1
Line regulation
ΔVV1
UJA1079A
Product data sheet
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Rev. 2 — 31 January 2011
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31 of 46
UJA1079A
NXP Semiconductors
LIN core system basis chip
Table 10. Static characteristics …continued
Tvj = −40 °C to +150 °C; VBAT = 4.5 V to 28 V; VBAT > VV1; RLIN = 500 Ω; all voltages are defined with respect to ground;
positive currents flow in the IC; typical values are given at VBAT = 14 V; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
3.5
5.8
8
mA
74
130
191
mA
PNP base; pin VEXCTRL
IO(sc)
short-circuit output current
VVEXCTRL ≥ 4.5 V; VBAT = 6 V to 28 V
Ith(act)PNP
PNP activation threshold
current
load current increasing; external PNP
transistor connected - see Section 6.6.2
PDC 0
Ith(deact)PNP
PNP deactivation threshold
current
PDC 0; Tvj = 150 °C
74
85
99
mA
PDC 1
44
76
114
mA
PDC 1; Tvj = 150 °C
44
50
59
mA
PDC 0
40
76
120
mA
PDC 0; Tvj = 150 °C
44
50
59
mA
PDC 1
11
22
36
mA
PDC 1; Tvj = 150 °C
12
15
18
mA
240
-
330
mV
0.7VV1
V
load current falling; external PNP
transistor connected - see Section 6.6.2
PNP collector; pin VEXCC
Vth(act)Ilim
current limiting activation
threshold voltage
measured across resistor connected
between pins VEXCC and V1 (see
Section 6.6.2)
2.97 V ≤ VV1 ≤ 5.5 V; 6 V < VBAT < 28 V
Serial peripheral interface inputs; pins SDI. SCK and SCSN
Vth(sw)
switching threshold voltage
VV1 = 2.97 V to 5.5 V
Vhys(i)
input hysteresis voltage
VV1 = 2.97 V to 5.5 V
100
-
900
mV
Rpd(SCK)
pull-down resistance on pin
SCK
50
130
400
kΩ
Rpu(SCSN)
pull-up resistance on pin
SCSN
50
130
400
kΩ
ILI(SDI)
input leakage current on pin
SDI
−5
-
+5
μA
0.3VV1 -
Serial peripheral interface data output; pin SDO
IOH
HIGH-level output current
VSCSN = 0 V; VO = VV1 − 0.4 V
VV1 = 2.97 V to 5.5 V
−30
-
−1.6
mA
IOL
LOW-level output current
VSCSN = 0 V; VO = 0.4 V
VV1 = 2.97 V to 5.5 V
1.6
-
30
mA
ILO
output leakage current
VSCSN = VV1; VO = 0 V to VV1
VV1 = 2.97 V to 5.5 V
−5
-
5
μA
Reset output with clamping detection; pin RSTN
IOH
HIGH-level output current
VRSTN = 0.8VV1
VV1 = 2.97 V to 5.5 V
−1500
-
−100
μA
IOL
LOW-level output current
strong; VRSTN = 0.2VV1
VV1 = 2.97 V to 5.5 V
−40 °C < Tvj < 200 °C
4.9
-
40
mA
weak; VRSTN = 0.8VV1
VV1 = 2.97 V to 5.5 V
−40 °C < Tvj < 200 °C
200
-
540
μA
UJA1079A
Product data sheet
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Rev. 2 — 31 January 2011
© NXP B.V. 2011. All rights reserved.
32 of 46
UJA1079A
NXP Semiconductors
LIN core system basis chip
Table 10. Static characteristics …continued
Tvj = −40 °C to +150 °C; VBAT = 4.5 V to 28 V; VBAT > VV1; RLIN = 500 Ω; all voltages are defined with respect to ground;
positive currents flow in the IC; typical values are given at VBAT = 14 V; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VOL
LOW-level output voltage
VV1 = 1 V to 5.5 V
pull-up resistor to VV1 ≥ 900 Ω
−40 °C < Tvj < 200 °C; VBAT < 28 V
0
-
0.2VV1
V
VV1 = 2.975 V to 5.5 V
pull-up resistor to V1 ≥ 900 Ω
−40 °C < Tvj < 200 °C
0
-
0.5
V
VOH
HIGH-level output voltage
-40 °C < Tvj < 200 °C
0.8VV1 -
VV1 +
0.3
V
Vth(sw)
switching threshold voltage
VV1 = 2.97 V to 5.5 V
0.3VV1 -
0.7VV1
V
Vhys(i)
input hysteresis voltage
VV1 = 2.97 V to 5.5 V
100
-
900
mV
VOL = 0.4 V
1.6
-
15
mA
Interrupt output; pin INTN
IOL
LOW-level output current
Enable output; pin EN
IOH
HIGH-level output current
VOH = VV1 − 0. 4 V
VV1 = 2.97 V to 5.5 V
−20
-
−1.6
mA
IOL
LOW-level output current
VOL = 0.4 V; VV1 = 2.97 V to 5.5 V
1.6
-
20
mA
VOL
LOW-level output voltage
IOL = 20 μA; VV1 = 1.5 V
-
-
0.4
V
Watchdog off input; pin WDOFF
Vth(sw)
switching threshold voltage
VV1 = 2.97 V to 5.5 V
0.3VV1 -
0.7VV1
V
Vhys(i)
input hysteresis voltage
VV1 = 2.97 V to 5.5 V
100
-
900
mV
Rpupd
pull-up/pull-down resistance
VV1 = 2.97 V to 5.5 V
5
10
20
kΩ
Wake input; pin WAKE1, WAKE2
Vth(sw)
switching threshold voltage
2
-
3.75
V
Vhys(i)
input hysteresis voltage
100
-
1000
mV
Ipu
pull-up current
VWAKE = 0 V for t < twake
−2
-
0
μA
Ipd
pull-down current
VWAKE = VBAT for t < twake
0
-
2
μA
VLIMP = 0.4 V; LHC = 1
Tvj = −40 °C to 200 °C
0.8
-
8
mA
VWBIAS = 1.4 V
1
-
7
mA
0.3VV1 -
0.7VV1
V
Limp home output; pin LIMP
IO
output current
Wake bias output; pin WBIAS
IO
output current
LIN transmit data input; pin TXDL
Vth(sw)
switching threshold voltage
VV1 = 2.97 V to 5.5 V
Vhys(i)
input hysteresis voltage
VV1 = 2.97 V to 5.5 V
Rpu
pull-up resistance
100
-
900
mV
4
12
25
kΩ
−20
-
−1.5
mA
LIN receive data output; pin RXDL
LIN Active mode; VRXDL = VV1 − 0.4 V
IOH
HIGH-level output current
IOL
LOW-level output current
VRXDL= 0.4 V
1.6
-
20
mA
Rpu
pull-up resistance
MC = 00; Standby mode
4
12
25
kΩ
UJA1079A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 31 January 2011
© NXP B.V. 2011. All rights reserved.
33 of 46
UJA1079A
NXP Semiconductors
LIN core system basis chip
Table 10. Static characteristics …continued
Tvj = −40 °C to +150 °C; VBAT = 4.5 V to 28 V; VBAT > VV1; RLIN = 500 Ω; all voltages are defined with respect to ground;
positive currents flow in the IC; typical values are given at VBAT = 14 V; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
LIN bus line; pin LIN
IBUS_LIM
current limitation for driver
dominant state
LIN Active mode; VBAT = VLIN = 18 V
VTXDL = 0 V
40
-
100
mA
IBUS_PAS_rec
receiver recessive input
leakage current
VLIN = 28 V; VBAT = 5.5 V; VTXDL = VV1
-
-
2
μA
IBUS_PAS_dom
receiver dominant input
leakage current including
pull-up resistor
VTXDL = VV1; VLIN = 0 V; VBAT = 14 V
−10
-
+10
μA
IL(log)
loss of ground leakage
current
VBAT = VGND = 28 V; VLIN = 0 V
−100
-
10
μA
IL(lob)
loss of battery leakage
current
VBAT = 0 V; VLIN = 28 V
-
-
2
μA
Vrec(RX)
receiver recessive voltage
VBAT = 5.5 V to 18 V
0.6 ×
VBAT
-
-
V
Vdom(RX)
receiver dominant voltage
VBAT = 5.5 V to 18 V
-
-
0.4VBAT V
Vth(cntr)RX
receiver center threshold
voltage
Vth(cntr)RX = (Vth(rec)RX + Vth(dom)RX)/2
VBAT = 5.5 V to 18 V ; LIN Active mode
0.475 0.5 ×
× VBAT VBAT
0.525 ×
VBAT
V
Vth(hys)RX
receiver hysteresis threshold
voltage
Vth(hys)RX = Vth(rec)RX − Vth(dom)RX
VBAT = 5.5 V to 18 V; LIN Active mode
0.05 ×
VBAT
0.15 ×
VBAT
0.175 ×
VBAT
V
CLIN
capacitance on pin LIN
with respect to GND
-
-
30
pF
VO(dom)
dominant output voltage
LIN Active mode; VTXDL = 0 V
VBAT = 7 V
-
-
1.4
V
LIN Active mode; VTXDL = 0 V
VBAT = 18 V
-
-
2.0
V
5 mA < IDLIN < 20 mA
0.4
0.65
1
V
LIN bus termination; pin DLIN
ΔV(DLIN-BAT)
voltage difference between
pin DLIN and pin BAT
Temperature protection
Tth(act)otp
overtemperature protection
activation threshold
temperature
165
180
200
°C
Tth(rel)otp
overtemperature protection
release threshold
temperature
126
138
150
°C
UJA1079A
Product data sheet
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Rev. 2 — 31 January 2011
© NXP B.V. 2011. All rights reserved.
34 of 46
UJA1079A
NXP Semiconductors
LIN core system basis chip
10. Dynamic characteristics
Table 11. Dynamic characteristics
Tvj = −40 °C to +150 °C; VBAT = 4.5 V to 28 V; VBAT > VV1; RLIN = 500 Ω; all voltages are defined with respect to ground;
positive currents flow in the IC; typical values are given at VBAT = 14 V; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VV1 falling; dVV1/dt = 0.1 V/μs
7
-
23
μs
95
-
140
ms
Voltage source; pin V1
td(uvd)
undervoltage detection delay
time
tdet(CL)L
LOW-level clamping detection VV1 < 0.9VO(V1)nom; V1 active
time
VWDOFF = 0 V (WD versions only)
Serial peripheral interface timing; pins SCSN, SCK, SDI and SDO
tcy(clk)
clock cycle time
VV1 = 2.97 V to 5.5 V
320
-
-
ns
tSPILEAD
SPI enable lead time
VV1 = 2.97 V to 5.5 V; clock is LOW
when SPI select falls
110
-
-
ns
tSPILAG
SPI enable lag time
VV1 = 2.97 V to 5.5 V; clock is LOW
when SPI select rises
140
-
-
ns
tclk(H)
clock HIGH time
VV1 = 2.97 V to 5.5 V
160
-
-
ns
tclk(L)
clock LOW time
VV1 = 2.97 V to 5.5 V
160
-
-
ns
tsu(D)
data input set-up time
VV1 = 2.97 V to 5.5 V
0
-
-
ns
th(D)
data input hold time
VV1 = 2.97 V to 5.5 V
80
-
-
ns
tv(Q)
data output valid time
pin SDO; VV1 = 2.97 V to 5.5 V
CL = 100 pF
-
-
110
ns
tWH(S)
chip select pulse width HIGH
VV1 = 2.97 V to 5.5 V
20
-
-
ns
long; Rpu(RSTN) > 25 kΩ
20
-
25
ms
short; Rpu(RSTN) = 900 Ω to 1100 Ω
Reset output; pin RSTN
tw(rst)
reset pulse width
3.6
-
5
ms
tdet(CL)L
LOW-level clamping detection RSTN driven HIGH internally but pin
time
RSTN remains LOW; VWDOFF = 0 V
(WD versions only)
95
-
140
ms
tfltr
filter time
7
-
18
μs
0.9
-
2.3
ms
Watchdog off input; pin WDOFF
tfltr
filter time
Wake input; pin WAKE1, WAKE2
twake
wake-up time
10
-
40
μs
td(po)
power-on delay time
113
-
278
μs
0.396
-
-
0.396
-
-
LIN transceiver; pins LIN, TXDL, RXDL
δ1
UJA1079A
Product data sheet
duty cycle 1
Vth(rec)RX(max) = 0.744VBAT
Vth(dom)RX(max) = 0.581VBAT; tbit = 50 μs
VBAT = 7 V to 18 V; LSC = 0
[1]
Vth(rec)RX(max) = 0.76VBAT
Vth(dom)RX(max) = 0.593VBAT; tbit = 50 μs
VBAT = 5.5 V to 7 V; LSC = 0
[1]
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 31 January 2011
[2]
[2]
© NXP B.V. 2011. All rights reserved.
35 of 46
UJA1079A
NXP Semiconductors
LIN core system basis chip
Table 11. Dynamic characteristics …continued
Tvj = −40 °C to +150 °C; VBAT = 4.5 V to 28 V; VBAT > VV1; RLIN = 500 Ω; all voltages are defined with respect to ground;
positive currents flow in the IC; typical values are given at VBAT = 14 V; unless otherwise specified.
Symbol
δ2
Parameter
Conditions
duty cycle 2
δ3
duty cycle 3
δ4
duty cycle 4
Vth(rec)RX(min) = 0.422VBAT
Vth(dom)RX(min) = 0.284VBAT; tbit = 50 μs
VBAT = 7.6 V to 18 V; LSC = 0
[2]
Vth(rec)RX(min) = 0.41VBAT
Vth(dom)RX(min) = 0.275VBAT; tbit = 50 μs
VBAT = 6.1 V to 7.6 V; LSC = 0
[2]
Vth(rec)RX(max) = 0.778VBAT
Vth(dom)RX(max) = 0.616VBAT
tbit = 96 μs; VBAT = 7 V to 18 V
LSC = 1
[1]
Vth(rec)RX(max) = 0.797VBAT
Vth(dom)RX(max) = 0.630VBAT
tbit = 96 μs; VBAT = 5.5 V to 7 V
LSC = 1
[1]
Vth(rec)RX(min) = 0.389VBAT
Vth(dom)RX(min) = 0.251VBAT; tbit = 96 μs
VBAT = 7.6 V to 18 V; LSC = 1
[2]
Vth(rec)RX(min) = 0.378VBAT
Vth(dom)RX(min) = 0.242VBAT; tbit = 96 μs
VBAT = 6.1 V to 7.6 V; LSC = 1
[2]
Min
Typ
Max
-
-
0.581
-
-
0.581
0.417
-
-
0.417
-
-
-
-
0.590
-
-
0.590
Unit
[3]
[3]
[2]
[2]
[3]
[3]
tPD(RX)r
rising receiver propagation
delay
VBAT = 5.5 V to 18 V; RRXDL = 2.4 kΩ
CRXDL = 20 pF
-
-
6
μs
tPD(RX)f
falling receiver propagation
delay
VBAT = 5.5 V to 18 V; RRXDL = 2.4 kΩ
CRXDL = 20 pF
-
-
6
μs
tPD(RX)sym
receiver propagation delay
symmetry
VBAT = 5.5 V to 18 V; RRXDL = 2.4 kΩ
CRXDL = 20 pF
−2
-
+2
μs
twake(busdom)min
minimum bus dominant
wake-up time
28
-
104
μs
tto(dom)TXDL
TXDL dominant time-out time LIN online mode; VTXDL = 0 V
20
-
80
ms
227
-
278
μs
WBC = 1
58.1
-
71.2
ms
WBC = 0
14.5
-
17.8
ms
[4]
Wake bias output; pin WBIAS
tWBIASL
WBIAS LOW time
tcy
cycle time
Watchdog
ttrig(wd)1
watchdog trigger time 1
Normal mode
watchdog Window mode only
[5]
0.45 × NWP[6]
0.555 ×
NWP[6]
ms
ttrig(wd)2
watchdog trigger time 2
Normal, Standby and Sleep modes
watchdog Window mode only
[7]
0.9 ×
NWP[6]
1.11 ×
NWP[6]
ms
460.8
563.2
kHz
Oscillator
oscillator frequency
fosc
[1]
t bus ( rec ) ( min )
δ1, δ3 = ------------------------------.
2 × t bit
[2]
Bus load conditions are: CL = 1 nF and RL = 1 kΩ; CL = 6.8 nF and RL = 660 Ω; CL = 10 nF and RL = 500 Ω.
UJA1079A
Product data sheet
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Rev. 2 — 31 January 2011
512
© NXP B.V. 2011. All rights reserved.
36 of 46
UJA1079A
NXP Semiconductors
LIN core system basis chip
[3]
t bus ( rec ) ( max )
δ2, δ4 = -------------------------------.
2 × t bit
[4]
tPD(RX)sym = tPD(RX)r − tPD(RX)f.
[5]
A system reset will be performed if the watchdog is in Window mode and is triggered less than ttrig(wd)1 after the start of the watchdog
period (or in the first half of the watchdog period).
[6]
The nominal watchdog period is programmed via the NWP control bits in the WD_and_Status register (see Table 4); valid in watchdog
Window mode only.
[7]
The watchdog will be reset if it is in window mode and is triggered at least ttrig(wd)1, but not more than ttrig(wd)2, after the start of the
watchdog period (or in the second half of the watchdog period). A system reset will be performed if the watchdog is triggered more than
ttrig(wd)2 after the start of the watchdog period (watchdog overflows).
BAT
DLIN
RXDL
RLIN
SBC
CRXDL
TXDL
LIN
CLIN
GND
015aaa204
Fig 15. Timing test circuit for LIN transceiver
tbit
tbit
tbit
VTXDL
tbus(rec)(min)
tbus(dom)(max)
VBAT
Vth(rec)RX(max)
Vth(dom)RX(max)
LIN bus signal
Vth(rec)RX(min)
Vth(dom)RX(min)
tbus(dom)(min)
output of receiving
node A
VRXDL
output of receiving
node B
VRXDL
thresholds of
receiving node A
thresholds of
receiving node B
tbus(rec)(max)
tPD(RX)f
tPD(RX)r
tPD(RX)r
tPD(RX)f
015aaa133
Fig 16. LIN transceiver timing diagram
UJA1079A
Product data sheet
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Rev. 2 — 31 January 2011
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SCSN
tSPILEAD
tSPILAG
Tcy(clk)
tclk(H)
tclk(L)
tsu(D)
th(D)
tWH(S)
SCK
SDI
MSB
X
LSB
X
tv(Q)
floating
SDO
floating
X
MSB
LSB
015aaa045
Fig 17. SPI timing diagram
11. Test information
11.1 Quality information
This product has been qualified in accordance with the Automotive Electronics Council
(AEC) standard Q100 - Failure mechanism based stress test qualification for integrated
circuits, and is suitable for use in automotive applications.
UJA1079A
Product data sheet
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12. Package outline
HTSSOP32: plastic thermal enhanced thin shrink small outline package; 32 leads;
body width 6.1 mm; lead pitch 0.65 mm; exposed die pad
SOT549-1
E
D
A
X
c
y
HE
exposed die pad side
v M A
Dh
Z
32
17
A2
Eh
(A3)
A
A1
pin 1 index
θ
Lp
L
detail X
16
1
w M
bp
e
2.5
0
5 mm
scale
DIMENSIONS (mm are the original dimensions).
UNIT
A
max.
A1
A2
A3
bp
c
D(1)
Dh
E(2)
Eh
e
HE
L
Lp
v
w
y
Z
θ
mm
1.1
0.15
0.05
0.95
0.85
0.25
0.30
0.19
0.20
0.09
11.1
10.9
5.1
4.9
6.2
6.0
3.6
3.4
0.65
8.3
7.9
1
0.75
0.50
0.2
0.1
0.1
0.78
0.48
8o
o
0
Notes
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.
OUTLINE
VERSION
SOT549-1
REFERENCES
IEC
JEDEC
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
03-04-07
05-11-02
MO-153
Fig 18. Package outline SOT549-1 (HTSSOP32)
UJA1079A
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13. Soldering of SMD packages
This text provides a very brief insight into a complex technology. A more in-depth account
of soldering ICs can be found in Application Note AN10365 “Surface mount reflow
soldering description”.
13.1 Introduction to soldering
Soldering is one of the most common methods through which packages are attached to
Printed Circuit Boards (PCBs), to form electrical circuits. The soldered joint provides both
the mechanical and the electrical connection. There is no single soldering method that is
ideal for all IC packages. Wave soldering is often preferred when through-hole and
Surface Mount Devices (SMDs) are mixed on one printed wiring board; however, it is not
suitable for fine pitch SMDs. Reflow soldering is ideal for the small pitches and high
densities that come with increased miniaturization.
13.2 Wave and reflow soldering
Wave soldering is a joining technology in which the joints are made by solder coming from
a standing wave of liquid solder. The wave soldering process is suitable for the following:
• Through-hole components
• Leaded or leadless SMDs, which are glued to the surface of the printed circuit board
Not all SMDs can be wave soldered. Packages with solder balls, and some leadless
packages which have solder lands underneath the body, cannot be wave soldered. Also,
leaded SMDs with leads having a pitch smaller than ~0.6 mm cannot be wave soldered,
due to an increased probability of bridging.
The reflow soldering process involves applying solder paste to a board, followed by
component placement and exposure to a temperature profile. Leaded packages,
packages with solder balls, and leadless packages are all reflow solderable.
Key characteristics in both wave and reflow soldering are:
•
•
•
•
•
•
Board specifications, including the board finish, solder masks and vias
Package footprints, including solder thieves and orientation
The moisture sensitivity level of the packages
Package placement
Inspection and repair
Lead-free soldering versus SnPb soldering
13.3 Wave soldering
Key characteristics in wave soldering are:
• Process issues, such as application of adhesive and flux, clinching of leads, board
transport, the solder wave parameters, and the time during which components are
exposed to the wave
• Solder bath specifications, including temperature and impurities
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13.4 Reflow soldering
Key characteristics in reflow soldering are:
• Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to
higher minimum peak temperatures (see Figure 19) than a SnPb process, thus
reducing the process window
• Solder paste printing issues including smearing, release, and adjusting the process
window for a mix of large and small components on one board
• Reflow temperature profile; this profile includes preheat, reflow (in which the board is
heated to the peak temperature) and cooling down. It is imperative that the peak
temperature is high enough for the solder to make reliable solder joints (a solder paste
characteristic). In addition, the peak temperature must be low enough that the
packages and/or boards are not damaged. The peak temperature of the package
depends on package thickness and volume and is classified in accordance with
Table 12 and 13
Table 12.
SnPb eutectic process (from J-STD-020C)
Package thickness (mm)
Package reflow temperature (°C)
Volume (mm3)
< 350
≥ 350
< 2.5
235
220
≥ 2.5
220
220
Table 13.
Lead-free process (from J-STD-020C)
Package thickness (mm)
Package reflow temperature (°C)
Volume (mm3)
< 350
350 to 2000
> 2000
< 1.6
260
260
260
1.6 to 2.5
260
250
245
> 2.5
250
245
245
Moisture sensitivity precautions, as indicated on the packing, must be respected at all
times.
Studies have shown that small packages reach higher temperatures during reflow
soldering, see Figure 19.
UJA1079A
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temperature
maximum peak temperature
= MSL limit, damage level
minimum peak temperature
= minimum soldering temperature
peak
temperature
time
001aac844
MSL: Moisture Sensitivity Level
Fig 19. Temperature profiles for large and small components
For further information on temperature profiles, refer to Application Note AN10365
“Surface mount reflow soldering description”.
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14. Revision history
Table 14.
Revision history
Document ID
Release date
Data sheet status
Change notice
Supersedes
UJA1079A v.2
20110131
Product data sheet
-
UJA1079A v.1
Modifications:
UJA1079A v.1
UJA1079A
Product data sheet
•
•
•
•
•
•
Section 6.7: text amended
Figure 9, Figure 10: added
Table 8: parameter values/conditions revised - Vtrt
Table 9: parameter values/conditions revised - Rth(j-a)
Table 10: parameter values/conditions revised - Cext changed to CLIN
Table 11: parameter values/conditions revised - tdet(CL)L for pins V1 and RSTN, δ1, δ2, δ3, δ4
20100709
Product data sheet
-
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Rev. 2 — 31 January 2011
-
© NXP B.V. 2011. All rights reserved.
43 of 46
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15. Legal information
15.1 Data sheet status
Document status[1][2]
Product status[3]
Definition
Objective [short] data sheet
Development
This document contains data from the objective specification for product development.
Preliminary [short] data sheet
Qualification
This document contains data from the preliminary specification.
Product [short] data sheet
Production
This document contains the product specification.
[1]
Please consult the most recently issued document before initiating or completing a design.
[2]
The term ‘short data sheet’ is explained in section “Definitions”.
[3]
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
15.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
for quick reference only and should not be relied upon to contain detailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.
Product specification — The information and data provided in a Product
data sheet shall define the specification of the product as agreed between
NXP Semiconductors and its customer, unless NXP Semiconductors and
customer have explicitly agreed otherwise in writing. In no event however,
shall an agreement be valid in which the NXP Semiconductors product is
deemed to offer functions and qualities beyond those described in the
Product data sheet.
15.3 Disclaimers
Limited warranty and liability — Information in this document is believed to
be accurate and reliable. However, NXP Semiconductors does not give any
representations or warranties, expressed or implied, as to the accuracy or
completeness of such information and shall have no liability for the
consequences of use of such information.
In no event shall NXP Semiconductors be liable for any indirect, incidental,
punitive, special or consequential damages (including - without limitation - lost
profits, lost savings, business interruption, costs related to the removal or
replacement of any products or rework charges) whether or not such
damages are based on tort (including negligence), warranty, breach of
contract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, NXP Semiconductors’ aggregate and cumulative liability towards
customer for the products described herein shall be limited in accordance
with the Terms and conditions of commercial sale of NXP Semiconductors.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
Suitability for use in automotive applications — This NXP
Semiconductors product has been qualified for use in automotive
applications. The product is not designed, authorized or warranted to be
UJA1079A
Product data sheet
suitable for use in medical, military, aircraft, space or life support equipment,
nor in applications where failure or malfunction of an NXP Semiconductors
product can reasonably be expected to result in personal injury, death or
severe property or environmental damage. NXP Semiconductors accepts no
liability for inclusion and/or use of NXP Semiconductors products in such
equipment or applications and therefore such inclusion and/or use is at the
customer’s own risk.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and operation of their applications
and products using NXP Semiconductors products, and NXP Semiconductors
accepts no liability for any assistance with applications or customer product
design. It is customer’s sole responsibility to determine whether the NXP
Semiconductors product is suitable and fit for the customer’s applications and
products planned, as well as for the planned application and use of
customer’s third party customer(s). Customers should provide appropriate
design and operating safeguards to minimize the risks associated with their
applications and products.
NXP Semiconductors does not accept any liability related to any default,
damage, costs or problem which is based on any weakness or default in the
customer’s applications or products, or the application or use by customer’s
third party customer(s). Customer is responsible for doing all necessary
testing for the customer’s applications and products using NXP
Semiconductors products in order to avoid a default of the applications and
the products or of the application or use by customer’s third party
customer(s). NXP does not accept any liability in this respect.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial sale — NXP Semiconductors
products are sold subject to the general terms and conditions of commercial
sale, as published at http://www.nxp.com/profile/terms, unless otherwise
agreed in a valid written individual agreement. In case an individual
agreement is concluded only the terms and conditions of the respective
agreement shall apply. NXP Semiconductors hereby expressly objects to
applying the customer’s general terms and conditions with regard to the
purchase of NXP Semiconductors products by customer.
No offer to sell or license — Nothing in this document may be interpreted or
construed as an offer to sell products that is open for acceptance or the grant,
conveyance or implication of any license under any copyrights, patents or
other industrial or intellectual property rights.
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 31 January 2011
© NXP B.V. 2011. All rights reserved.
44 of 46
UJA1079A
NXP Semiconductors
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Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from national authorities.
15.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
16. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
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17. Contents
1
2
2.1
2.2
2.3
2.4
2.5
3
4
5
5.1
5.2
6
6.1
6.1.1
6.1.2
6.1.3
6.1.4
6.1.5
6.1.6
6.2
6.2.1
6.2.2
6.2.3
6.2.4
6.2.5
6.2.6
6.3
6.4
6.4.1
6.4.2
6.4.3
6.5
6.5.1
6.5.2
6.5.3
6.6
6.6.1
6.6.2
6.7
6.7.1
6.7.1.1
6.7.1.2
6.7.2
6.7.2.1
6.7.2.2
6.8
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features and benefits . . . . . . . . . . . . . . . . . . . . 2
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
LIN transceiver . . . . . . . . . . . . . . . . . . . . . . . . . 2
Power management . . . . . . . . . . . . . . . . . . . . . 2
Control and diagnostic features . . . . . . . . . . . . 2
Voltage regulator V1 . . . . . . . . . . . . . . . . . . . . . 3
Ordering information . . . . . . . . . . . . . . . . . . . . . 3
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pinning information . . . . . . . . . . . . . . . . . . . . . . 5
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
Functional description . . . . . . . . . . . . . . . . . . . 6
System Controller . . . . . . . . . . . . . . . . . . . . . . . 6
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Off mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Standby mode. . . . . . . . . . . . . . . . . . . . . . . . . . 9
Normal mode . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Sleep mode . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Overtemp mode . . . . . . . . . . . . . . . . . . . . . . . 10
SPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Register map . . . . . . . . . . . . . . . . . . . . . . . . . 11
WD_and_Status register. . . . . . . . . . . . . . . . . 12
Mode_Control register . . . . . . . . . . . . . . . . . . 13
Int_Control register . . . . . . . . . . . . . . . . . . . . . 14
Int_Status register. . . . . . . . . . . . . . . . . . . . . . 15
On-chip oscillator . . . . . . . . . . . . . . . . . . . . . . 16
Watchdog (UJA1079A/xx/WD versions) . . . . . 16
Watchdog Window behavior . . . . . . . . . . . . . . 16
Watchdog Timeout behavior . . . . . . . . . . . . . . 17
Watchdog Off behavior . . . . . . . . . . . . . . . . . . 17
System reset. . . . . . . . . . . . . . . . . . . . . . . . . . 17
RSTN pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
EN output . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
LIMP output . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Power supplies . . . . . . . . . . . . . . . . . . . . . . . . 19
Battery pin (BAT) . . . . . . . . . . . . . . . . . . . . . . 19
Voltage regulator V1 . . . . . . . . . . . . . . . . . . . . 19
LIN transceiver . . . . . . . . . . . . . . . . . . . . . . . . 21
LIN operating modes . . . . . . . . . . . . . . . . . . . 22
Active mode . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Lowpower/Off modes . . . . . . . . . . . . . . . . . . . 22
Fail-safe features . . . . . . . . . . . . . . . . . . . . . . 23
General fail-safe features . . . . . . . . . . . . . . . . 23
TXDL dominant time-out function . . . . . . . . . . 23
Local wake-up input . . . . . . . . . . . . . . . . . . . . 23
6.9
6.10
7
8
9
10
11
11.1
12
13
13.1
13.2
13.3
13.4
14
15
15.1
15.2
15.3
15.4
16
17
Interrupt output. . . . . . . . . . . . . . . . . . . . . . . .
Temperature protection . . . . . . . . . . . . . . . . .
Limiting values . . . . . . . . . . . . . . . . . . . . . . . .
Thermal characteristics . . . . . . . . . . . . . . . . .
Static characteristics . . . . . . . . . . . . . . . . . . .
Dynamic characteristics. . . . . . . . . . . . . . . . .
Test information . . . . . . . . . . . . . . . . . . . . . . .
Quality information . . . . . . . . . . . . . . . . . . . . .
Package outline. . . . . . . . . . . . . . . . . . . . . . . .
Soldering of SMD packages . . . . . . . . . . . . . .
Introduction to soldering. . . . . . . . . . . . . . . . .
Wave and reflow soldering. . . . . . . . . . . . . . .
Wave soldering . . . . . . . . . . . . . . . . . . . . . . .
Reflow soldering . . . . . . . . . . . . . . . . . . . . . .
Revision history . . . . . . . . . . . . . . . . . . . . . . .
Legal information . . . . . . . . . . . . . . . . . . . . . .
Data sheet status . . . . . . . . . . . . . . . . . . . . . .
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . .
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . .
Contact information . . . . . . . . . . . . . . . . . . . .
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24
24
26
28
30
35
38
38
39
40
40
40
40
41
43
44
44
44
44
45
45
46
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP B.V. 2011.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 31 January 2011
Document identifier: UJA1079A