ATMEL ATA6620

Features
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Supply Voltage up to 40V
Operating Voltage VS = 5V to 18V
Typically 10 µA Supply Current During Sleep Mode
Typically 40 µA Supply Current in Silent Mode
Linear Low-drop Voltage Regulator:
– Normal Mode: VCC = 5V ±2%/50 mA
– Silent Mode: VCC = 5V ±7%/50 mA
– Sleep Mode: VCC is Switched Off
VCC Undervoltage Detection with Reset Output NRES (10 ms Reset Time)
Voltage Regulator is Short-circuit and Over-temperature Protected
LIN Physical Layer According to LIN Specification Revision 2.0
Wake-up Capability via LIN Bus (90 µs Dominant)
TXD Time-out Timer (9 ms)
60V Load-dump Protection at LIN Pin
Bus Pin is Overtemperature and Short-circuit Protected versus GND and Battery
High EMC Level
5V CMOS-Compatible I/O Pins to MCU
ESD HBM 6kV at Pins LIN and VS
Interference and Damage Protection According to ISO/CD7637
Package: SO8
LIN Bus
Transceiver
with Integrated
Voltage
Regulator
ATA6620
Preliminary
1. Description
ATA6620 is a fully integrated LIN transceiver, designed according to the LIN specification 2.0, with a low-drop voltage regulator (5V/50 mA). The combination of voltage
regulator and bus transceiver makes it possible to develop simple, but powerful, slave
nodes in LIN Bus systems. ATA6620 is designed to handle the low-speed data communication in vehicles (for example, in convenience electronics). Improved slope
control at the LIN driver ensures secure data communication up to 20 kBaud with an
RC oscillator for the protocol handling. The bus output is designed to withstand high
voltage. Sleep mode (voltage regulator switched off) and Silent mode (communication
off; VCC voltage on) guarantee minimized current consumption.
Rev. 4850A–AUTO–02/05
Figure 1-1.
Block Diagram
RXD
5
VS
1
ATA6620
VCC
Normal and
Pre-normal
Mode
Receiver
4
LIN
Filter
VCC
Wake-up Bus Timer
TXD
TXD
Time-out
Timer
6
Short Circuit and
Overtemperature
Protection
Slew Rate Control
8
EN
GND
Normal Mode
Voltage Regulator
5V/50 mA/2%
Control
Unit
2
3
Sleep
Mode
VCC
Undervoltage Reset
Switched
Silent Mode
Off
Voltage Regulator
5V/50 mA/7%
7
VCC
NRES
2. Pin Configuration
Figure 2-1.
Pinning SO8
VS
EN
GND
LIN
Table 2-1.
2
1
2
3
4
8
7
6
5
VCC
NRES
TXD
RXD
Pin Description
Pin
Symbol
1
VS
Battery supply
Function
2
EN
Enables Normal mode if the input is high
3
GND
Ground
4
LIN
LIN bus line input/output
5
RXD
Receive data output
6
TXD
Transmit data input
7
NRES
8
VCC
Output undervoltage reset, low at reset
Output voltage regulator 5V/50 mA
ATA6620 [Preliminary]
4850A–AUTO–02/05
ATA6620 [Preliminary]
3. Functional Description
3.1
Supply Pin (VS)
LIN operating voltage is VS = 5V to 18V. An undervoltage detection is implemented to disable
transmission if VS falls below 5V, in order to avoid false bus messages. After switching on VS,
the IC starts with the Pre-normal mode and the voltage regulator is switched on (that is,
5V/50 mA output capability).
The supply current in Sleep mode is typically 10 µA and 40 µA in Silent mode.
3.2
Ground Pin (GND)
The IC is neutral on the LIN pin in case of GND disconnection. It is able to handle a ground shift
up to 3V for supply voltage above 9V at the VS pin.
3.3
Voltage Regulator Output Pin (VCC)
The internal 5V voltage regulator is capable of driving loads with up to 50 mA, supplying the
microcontroller and other ICs on the PCB. It is protected against overload by means of current
limitation and overtemperature shut-down. Furthermore, the output voltage is monitored and will
cause a reset signal at the NRES output pin if it drops below a defined threshold Vthun.
3.4
Undervoltage Reset Output (NRES)
This push-pull output is supplied from the VCC voltage. If the VCC voltage falls below the undervoltage detection threshold of Vthun, NRES switches to low after tres_f (Figure 4-6 on page 9).
Even if VCC = 0V the NRES stays low, because it is internally driven from the VS voltage. If VS
voltage ramps down, NRES stays low until VS < 1.5V and then becomes highly resistant.
The implemented undervoltage delay keeps NRES low for tReset = 10 ms after VCC reaches its
nominal value.
3.5
Bus Pin (LIN)
A low-side driver with internal current limitation and thermal shutdown, as well as an internal
pull-up resistor according to LIN specification 2.0 is implemented. The voltage range is from
–27V to +60V. This pin exhibits no reverse current from the LIN bus to VS, even in the case of a
GND shift or VBatt disconnection. The LIN receiver thresholds are compatible with the LIN protocol specification.
The fall time (from recessive to dominant) and the rise time (from dominant to recessive) are
slope controlled. The output has a short-circuit limitation. This is a self-adapting current limitation; that is, during current limitation, as the chip temperature increases, the current decreases.
3.6
Input Pin (TXD)
This pin is the microcontroller interface to control the state of the LIN output. TXD must be pulled
to ground in order to drive the LIN bus low. If TXD is high or unconnected (internal pull-up resistor), the LIN output transistor is turned off and the bus is in the recessive state.
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4850A–AUTO–02/05
3.7
Dominant Time-out Function (TXD)
The TXD input has an internal pull-up resistor. An internal timer prevents the bus line from being
driven permanently in the dominant state. If TXD is forced to low longer than TDOM > 4 ms, the
LIN bus driver is switched to the recessive state. To reset this dominant time-out mode, TXD
must be switched to high (>10 µs) before normal data transmission can be started.
3.8
Output Pin (RXD)
This pin reports the state of the LIN bus to the microcontroller. LIN high (recessive state) is
reported by a high level at RXD; LIN low (dominant state) is reported by a low level at RXD. The
output has an internal pull-up structure with typically 5 kΩ to VCC. The AC characteristics are
measured with an external load capacitor of 20 pF.
The output is short-circuit protected. In unpowered mode (that is, VS = 0V), RXD is switched off.
3.9
Enable Input Pin (EN)
This pin controls the operation mode of the interface. After power up of VS (battery), the IC
switches to Pre-normal mode, even if EN is low or unconnected (internal pull-down resistor). If
EN is high, the interface is in Normal mode.
A falling edge at EN while TXD is still high forces the device to Silent mode. A falling edge at EN
while TXD is low forces the device to Sleep mode.
4. Mode of Operation
Figure 4-1.
Mode of Operation
a: VS > 5V
b: VS < 4V
c: Bus wake-up event
Unpowered Mode
VBatt = 0V
b
a
Pre-normal Mode
b
VCC: 5V/2%/50 mA with undervoltage reset
b
Communication: OFF
c
EN = 1
Go to silent command
EN = 0
TXD = 1
Local wake-up event
Normal Mode
EN = 1
VCC: 5V/2%/50 mA
with undervoltage reset
Communication: ON
EN = 0
TXD = 0
c
b
Silent Mode
VCC: 5V/7%/50 mA
with undervoltage reset
Communication: OFF
Go to sleep command
Local wake-up event
Sleep Mode
VCC: switched off
Communication: OFF
EN = 1
4
ATA6620 [Preliminary]
4850A–AUTO–02/05
ATA6620 [Preliminary]
Table 4-1.
4.1
Mode of Operation
Mode of
Operation
Communication
VCC
RXD
LIN
Pre-normal
OFF
5V
5V
Recessive
Normal
ON
5V
5V
Recessive
Silent
OFF
5V
5V
Recessive
Sleep
OFF
0V
0V
Recessive
Normal Mode
This is the normal transmitting and receiving mode of the LIN Interface, in accordance with LIN
specification 2.0. The VCC voltage regulator operates with a 5V output voltage, with a low tolerance of ±2% and a maximum output current of 50 mA.
If an undervoltage condition occurs, NRES is switched to low and the ATA6620 changes state to
Pre-normal mode. All features are available.
4.2
Silent Mode
A falling edge at EN while TXD is high switches the IC into Silent mode. The TXD Signal has to
be logic high during the Mode Select window (Figure 4-2 on page 6). For EN and TXD either two
independent outputs can be used, or two outputs from the same microcontroller port; in the second case, the mode change is only one command.
In Silent mode the transmission path is disabled. Supply current from V Batt is typically
IVSsi = 40 µA with no load at the VCC regulator.
The overall supply current from VBatt is the result of 40 µA plus the VCC regulator output current
IVCCs.
The 5V regulator is in low tolerance mode (4.65V to 5.35V) and can source up to 50 mA. In
Silent mode the internal slave termination between pin LIN and pin VS is disabled to minimize
the power dissipation in case pin LIN is short-circuited to GND. Only a weak pull-up current (typically 10 µA) between pin LIN and pin VS is present.
The Silent mode voltage is sufficient to run an external microcontroller on the ECU, for example
in Power Down mode. The undervoltage reset is VCCthS < 4.4V. If an undervoltage condition
occurs, NRES is switched to low and the ATA6620 changes state to Pre-normal mode.
A falling edge at pin LIN followed by a dominant bus level maintained for a certain time period
(Tbus) results in a remote wake-up request. The device switches from Silent mode to Pre-normal
mode, then the internal LIN slave termination resistor is switched on. The remote wake-up
request is indicated by a low level at pin RXD to interrupt the microcontroller. (Figure 4-5 on
page 8)
With EN high, ATA6620 switches directly from Silent to Normal mode.
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4850A–AUTO–02/05
Figure 4-2.
Switch to Silent Mode
Silent Mode
Normal Mode
EN
Mode select window
TXD
Td = 3.2 µs
NRES
VCC
Delay time silent mode
Td_sleep = maximum 20 µs
LIN
LIN switches directly to recessive mode
Figure 4-3.
LIN Wake-up Waveform Diagram from Silent Mode
Normal Mode
Pre-normal Mode
LIN Bus
RXD
Low or floating
Low
Bus wake-up filtering
time Tbus
VCC
Silent mode
Pre-normal mode
Regulator Wake-up Time
EN
NRES
6
Normal mode
EN High
Node ln silent mode
If undervoltage switch to pre-normal mode
Undervoltage detection active
ATA6620 [Preliminary]
4850A–AUTO–02/05
ATA6620 [Preliminary]
4.3
Sleep Mode
A falling edge at EN while TXD is low switches the IC into Sleep mode. The TXD Signal has to
be logic low during the Mode Select window (Figure 4-4 on page 8). We recommend using the
same microcontroller port for EN as for TXD; in this case the mode change is only one
command.
In Sleep mode the transmission path is disabled. Supply current from V Batt is typically
IVSsleep = 10 µA. The VCC regulator is switched off; NRES and RXD are low. The internal slave
termination between pin LIN and pin VS is disabled to minimize the power dissipation in case pin
LIN is short-circuited to GND. Only a weak pull-up current (typically 10 µA) between pin LIN and
pin VS is present.
A falling edge at pin LIN followed by a dominant bus level maintained for a certain time period
(Tbus) results in a remote wake-up request. The device switches from Sleep mode to Pre-normal
mode. The VCC regulator is activated and the internal LIN slave termination resistor is switched
on. The remote wake-up request is indicated by a low level at pin RXD to interrupt the microcontroller. (Figure 4-5 on page 8)
With EN high you can switch directly from Silent to Normal mode. In the application where the
ATA6620 supplies the microcontroller, the wake-up from Sleep mode is only possible via pin
LIN.
4.4
Pre-normal Mode
At system power-up the device automatically switches to Pre-normal mode. The voltage regulator is switched on (VCC = 5V/50 mA) (see Figure 4-4 on page 8) after typically tVCC = 1 ms. The
NRES output switches to low for tres = 10 ms and sends a reset to the microcontroller. LIN communication is switched off, and the undervoltage detection is active.
A power-down of VBatt (VS < 4V) during Silent or Sleep mode switches into Pre-normal mode
after powering up the IC.
4.5
Unpowered Mode
If battery voltage is connected to the application circuit (Figure 4-6 on page 9), the voltage at the
VS pin increases due to the block capacitor. When VS is higher than the VS undervoltage threshold, VSth, the IC-mode changes from Unpowered to Pre-normal mode. The VCC output voltage
reaches nominal value after tVCC. This time depends on the VCC capacitor and the load.
NRES is low for the reset time delay tReset; no mode change is possible during this time.
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4850A–AUTO–02/05
Figure 4-4.
Switch to Sleep Mode
Sleep Mode
Normal Mode
EN
Mode select window
TXD
Td = 3.2 µs
NRES
VCC
Delay time sleep mode
Td_sleep = maximum 20 µs
LIN
LIN switches directly to recessive mode
Figure 4-5.
LIN Wake-up Diagram from Sleep Mode
Pre-normal Mode
Normal Mode
LIN Bus
RXD
Low or floating
Low
Bus wake-up filtering time
Tbus
On state
Off state
Regulator wake-up time
EN High
EN
Node in sleep mode
Reset
time
NRES
Low or floating
Microcontroller start-up
time delay
8
ATA6620 [Preliminary]
4850A–AUTO–02/05
ATA6620 [Preliminary]
Figure 4-6.
VCC Voltage Regulator: Ramp Up and Undervoltage
VS
12V
5.5V
3V
VCC
5V
Vthun
NRES
5V
TVCC
Tres
Tes_f
5. Fail Safe Features
• During a short circuit at LIN, the output limits the output current to IBUS_LIM. Due to the power
dissipation, the chip temperature exceeds TLINoff and the LIN output is switched off. The chip
cools down and after a hysteresis of Thys, switches the output on again. During LIN
overtemperature switch-off, the VCC regulator works independently.
• There are now reverse currents < 3 µA at pin LIN during loss of VBatt or GND. This is optimal
behavior for bus systems where some slave nodes are supplied from battery or ignition.
• During a short circuit at VCC, the output limits the output current to IVCCn. Because of
undervoltage, NRES switches to low and sends a reset to the microcontroller. The IC
switches into Pre–normal mode. If the chip temperature exceeds the value TVCCoff, the VCC
output switches off. The chip cools down and after a hysteresis of Thys, switches the output on
again. Because of Pre-normal mode, the VCC voltage will switch on again although EN is
switched off from the microcontroller.The microcontroller can then start with normal
operation.
• Pin EN provides a pull-down resistor to force the transceiver into recessive mode if EN is
disconnected.
• Pin RXD is set floating if VBatt is disconnected.
• Pin TXD provides a pull-up resistor to force the transceiver into recessive mode if TXD is
disconnected.
9
4850A–AUTO–02/05
6. Voltage Regulator
The voltage regulator needs an external capacitor for compensation and to smooth the disturbances from the microcontroller. It is recommend to use an electrolytic capacitor with C > 1.8 µF
and a tantalum capacitor with C = 100 nF. The values of these capacitors can be varied by the
customer, depending on the application.
During mode change from Silent to Normal mode, the voltage regulator ramps up to 6V for only
a few microseconds before it drops back to 5V. This behavior depends on the value of the load
capacitor. With 4.7 µF, the overshoot voltage has its greatest value. This voltage decreases with
higher or lower load capacitors.
With this special SO8 package (fused lead frame to pin3) an Rthja of 100 K/W is achieved.
Therefore it is recommended to connect pin 3 with a wide GND plate on the printed board to get
a good heat sink.
The main power dissipation of the IC is created from the VCC output current IVCC , which is
needed for the application.
Figure 6-1 shows the safe operating area of the ATA6620.
Figure 6-1.
Save Operating Area versus VCC Output Current and Supply Voltage VS at Different Ambient Temperatures
60.00
IOUT, Tamb = 85°C
IVCC/mA
50.00
40.00
IOUT, Tamb = 105°C
30.00
20.00
IOUT, Tamb = 95°C
10.00
0.00
5
6
7
8
9
10
11
12
13
14
15
16
17
18
VS /V
10
ATA6620 [Preliminary]
4850A–AUTO–02/05
ATA6620 [Preliminary]
7. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters
Max.
Unit
–0.3
+40
V
Logic pins (RxD, TxD, EN, NRES)
–0.3
+6.5
V
LIN
- DC voltage
- Transient voltage
–40
–150
+60
+100
V
V
VCC
- DC voltage
VS
- Continuous supply voltage
Symbol
Min.
Typ.
–0.3
+6.5
V
ESD (DIN EN 6100–4–2)
Pin LIN, VS versus GND according to LIN
specification EMC Evaluation V 1.3
–6
+6
kV
HBM ESD S5.1 – all pins
–2
+2
kV
–500
+500
V
CDM ESD STM 5.3.1–1999
- All pins
Junction temperature
Tj
–40
+150
°C
Storage temperature
Ts
–55
+150
°C
Operating ambient temperature
Ta
–40
+125
°C
145
K/W
Thermal resistance junction to ambient
(free air)
Special heat sink at GND (pin 3) on PCB
Rthja
100
K/W
Thermal shutdown of VCC regulator
TVCCoff
155
165
175
°C
Thermal shutdown of LIN output
TLINoff
155
165
175
°C
Thermal shutdown hysteresis
Rthja
Thys
7
°C
11
4850A–AUTO–02/05
8. Electrical Characteristics
5V < VS < 18V, Tamb = –40°C to 125°C
No.
1
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
5
13.5
18
V
A
VS Pin
1.1
Nominal DC voltage
range
VS
VS
1.2
Sleep mode
Supply current in Sleep Vlin > VBatt – 0.5V
mode
VBatt < 14V
(25°C to 125°C)
VS
IVSsleep
10
20
µA
A
1.3
Bus recessive;
Supply current in Silent VBatt < 14V
mode
(25°C to 125°C)
Without load at VCC
VS
IVSsi
40
50
µA
A
1.4
Supply current in
Normal mode
Bus recessive
Without load at VCC
VS
IVSrec
4
mA
A
1.5
Supply current in
Normal mode
Bus dominant
VCC load current 50 mA
VS
IVSdom
55
mA
A
1.6
Power On Reset
threshold
VS
PORth
3.3
V
D
1.7
Power On Reset
threshold hysteresis
VS
PORhys
V
D
1.8
VS undervoltage
threshold
VS
VSth
V
A
1.9
VS undervoltage
threshold hysteresis
VS
VSth_hys
V
A
RXD
IRXD
8
mA
A
0.4
V
A
V
A
7
kΩ
A
2
3
0.1
4.0
5
0.2
RXD Output Pin
Normal mode;
VLIN = 0V
VRXD = 0.4V
2
2.1
Low level input current
2.2
Low level output voltage IRXD = 1 mA
RXD
VRXDL
2.3
High level output voltage IRXD = –1 mA
RXD
VRXDH
4.2
2.4
Internal resistor to VCC
RXD
RRXD
3
3
4.5
5
5
TXD Input Pin
3.1
Low level voltage input
TXD
VTXDL
–0.3
+1.5
V
A
3.2
High level voltage input
TXD
VTXDH
3.5
VCC +
0.3V
V
A
3.3
Pull-up resistor
VTXD = 0V
TXD
RTXD
125
600
kΩ
A
3.4
High level leakage
current
VTXD = 5V
TXD
ITXD
–3
+3
µA
A
4
250
EN Input Pin
4.1
Low level voltage input
EN
VENL
–0.3
+1.5
V
A
4.2
High level voltage input
EN
VENH
3.5
VCC +
0.3V
V
A
4.3
Pull-down resistor
VEN = 5V
EN
REN
125
600
kΩ
A
4.4
Low level input current
VEN = 0V
EN
IEN
–3
+3
µA
A
250
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
12
ATA6620 [Preliminary]
4850A–AUTO–02/05
ATA6620 [Preliminary]
8. Electrical Characteristics (Continued)
5V < VS < 18V, Tamb = –40°C to 125°C
No.
5
Parameters
Test Conditions
Pin
Symbol
Min.
4.2
Typ.
Max.
Unit
Type*
V
A
NRES Output Pin
5.1
High level output voltage
VS ≥ 5.5V;
INRES = –1 mA
NRES
VNRESH
5.2
Low level output voltage
VS ≥ 5.5V;
INRES = –1 mA
NRES
VNRESL
0.4
V
A
5.3
Low level output low
10 kΩ to VCC;
VCC = 0.8V
NRES
VNRESLL
0.2
V
A
5.4
Undervoltage reset time
VVS ≥ 5.5V
CNRES = 20 pF
NRES
tReset
13
ms
A
5.5
Reset debounce time for VVS ≥ 5.5V
falling edge
CNRES = 20 pF
NRES
tres_f
5
µs
A
6
7
Voltage Regulator VCC Pin in Normal and Pre-normal Mode
6.1
Output voltage VCC
5.5V < VS < 18V
(0 mA – 50 mA)
VCC
VCCnor
4.9
5.1
V
A
6.2
Output voltage VCC at
low VS
3.3V < VS < 5.5V
(0 mA – 50 mA)
VCC
VCClow
VVS
– VD
5.1
V
A
6.3
Regulator drop voltage
VS > 4.0V, IVCC = 20 mA
VCC
VD
250
mV
A
6.4
Regulator drop voltage
VS > 4.0V, IVCC = 50 mA
VCC
VD
500
mV
A
6.5
Regulator drop voltage
VS > 3.3V, IVCC = 15 mA
VCC
VD
200
mV
A
6.6
Output current
VS > 3V
VCC
IVCC
–50
mA
A
6.7
Output current limitation VS > 0V
VCC
IVCCs
–200
–130
mA
A
6.8
Load capacity
ESR < 5Ω
VCC
Cload
1.8
2.2
µF
A
6.9
VCC undervoltage
threshold
Referred to VCC
VS > 5.5V
VCC
VthunN
4.4
V
A
6.10
Hysteresis of
undervoltage threshold
Referred to VCC
VS > 5.5V
VCC
Vhysthun
40
mV
A
6.11
Ramp up time VS > 5.5V CVCC = 2.2 µF
to VCC > 4.9V
Rload at VCC: 100Ω
VCC
tVCC
2
ms
A
7
Voltage Regulator VCC Pin in Silent Mode
4.8
1
7.1
Output voltage VCC
5.5V < VS < 18V
(0 mA – 50 mA)
VCC
VCCnor
4.65
5.35
V
A
7.2
Output voltage VCC at
low VS
3.3V < VS < 5.5V
(0 mA – 50 mA)
VCC
VCClow
VVS
– VD
5.1
V
A
7.3
Regulator drop voltage
VS > 3.3V, IVCC = 15 mA
VCC
VD
200
mV
A
7.4
At VCC undervoltage
threshold the state
switches back to
Pre-normal mode
Referred to VCC
VS > 5.5
VCC
VthunS
3.9
4.4
V
A
7.5
Hysteresis of
undervoltage
threshold
Referred to VCC
VS > 5.5V
VCC
Vhysthun
40
mV
D
7.6
Output current limitation VS > 0V
VCC
IVCCs
–200
mA
A
–130
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
13
4850A–AUTO–02/05
8. Electrical Characteristics (Continued)
5V < VS < 18V, Tamb = –40°C to 125°C
No.
8
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
VS
V
A
LIN Bus Driver: Bus Load Conditions:
Load 1 (Small): 1 nF, 1 kΩ; Load 2 (Large): 10 nF, 500Ω; RRXD = 5 kΩ; CRXD = 20 pF
10.5, 10.6 and 10.7 Specifies the Timing Parameters for Proper Operation at 20 Kbps
8.1
Driver recessive output
voltage
VTXD = 0V;
ILIN = 0 mA
LIN
VBUSrec
8.2
Driver dominant voltage
VVS = 7.3V
Rload = 500 Ω
LIN
V_LoSUP
1.2
V
A
8.3
Driver dominant voltage
VVS = 18V
Rload = 500 Ω
LIN
V_HiSUP
2
V
A
8.4
Driver dominant voltage
VVS = 7.3V
Rload = 1000 Ω
LIN
V_LoSUP_1k
0.6
V
A
8.5
Driver dominant voltage
VVS = 18V
Rload = 1000 Ω
LIN
V_HiSUP_1k
0.8
V
A
8.6
Pull–up resistor to VS
The serial diode is
mandatory
LIN
RLIN
20
60
kΩ
A
8.7
Self-adapting current
limitation
VBUS = VBatt_max
Tj = 125°C
Tj = 27°C
Tj = –40°C
LIN
IBUS_LIM
52
100
150
110
170
230
mA
mA
mA
A
8.8
Input leakage current at
the receiver including
pull–up resistor as
specified
Input Leakage current
Driver off
VBUS = 0V
VBatt = 12V
LIN
IBUS_PAS_dom
–1
mA
A
8.9
Leakage current LIN
recessive
Driver off
8V < VBatt < 18V
8V < VBUS < 18V
VBUS ≥ VBatt
LIN
IBUS_PAS_rec
8.10
Leakage current when
control unit
disconnected from
ground.
Loss of local ground
must not affect
communication in the
residual network
GNDDevice = VS
VBatt = 12V
0V < VBUS < 18V
LIN
IBUS_NO_gnd
8.11
Node has to sustain the
current that can flow
VBatt disconnected
under this condition.
VSUP_Device = GND
Bus must remain
0V < VBUS < 18V
operational under this
condition
LIN
IBUS
0.9 × VS
–10
30
15
20
µA
A
+0.5
+10
µA
A
0.5
3
µA
A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
14
ATA6620 [Preliminary]
4850A–AUTO–02/05
ATA6620 [Preliminary]
8. Electrical Characteristics (Continued)
5V < VS < 18V, Tamb = –40°C to 125°C
No.
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
VBUS_CNT =
(Vth_dom + Vth_rec)/2
LIN
VBUS_CNT
0.475 ×
VS
0.5 ×
VS
0.525 ×
VS
V
A
9
LIN Bus Receiver
9.1
Center of receiver
threshold
9.2
Receiver dominant state VEN = 5V
LIN
VBUSdom
–27
0.4 × VS
V
A
9.3
Receiver recessive state VEN = 5V
LIN
VBUSrec
0.6 × VS
40
V
A
9.4
Receiver input
hysteresis
LIN
VBUShys
0.028 ×
VS
0.175 ×
VS
V
A
9.5
Wake detection LIN
High level input voltage
LIN
VLINH
VS – 1V
VS + 0.3V
V
A
9.6
Wake detection LIN
Low level input voltage
ILIN = typically –3 mA
LIN
VLINL
–27
VS – 3V
V
A
9.7
LIN pull-up current
VS < 27V
LIN
ILIN
–30
–10
µA
A
10
Internal Timers
Vhys = Vth_rec – Vth_dom
0.1 x VS
10.1
Dominant time for
wake–up via LIN bus
VLIN = 0V
tbus
30
90
150
µs
A
10.2
Time delay for mode
change from Pre-normal
VEN = 5V
into Normal mode via
pin EN
tnorm
1
5
10
µs
A
10.3
Time delay for mode
change from Normal
V = 0V
mode to Sleep mode via EN
pin EN
tsleep
2
7
12
µs
A
10.4
TXD dominant time out
timer
VTXD = 0V
tdom
5
10
20
ms
A
Duty cycle 1
THRec(max) = 0.744 × VS;
THDom(max) = 0.581 × VS;
VS = 7.0V to 18V;
tBit = 50 ms
D1 = tbus_rec(min)/(2 × tBit)
D1
0.396
10.6
Duty cycle 2
THRec(min) = 0.422 × VS;
THDom(min) = 0.284 × VS;
VS = 7.0V to 18V;
tBit = 50ms
D2 = tbus_rec(max)/(2 × tBit)
D2
10.7
Slope time falling and
rising edge at LIN
10.5
11
tSLOPE_fall
tSLOPE_rise
A
0.581
3.5
A
22.5
µs
A
6
µs
A
+2
µs
A
Receiver Electrical AC Parameters of the LIN Physical Layer
LIN Receiver, RXD Load Conditions (CRXD): 20 pF; Rpull-up = 2.4 kΩ
trec_pd =
max(trx_pdr, trx_pdf)
11.1
Propagation delay of
receiver Figure 4-4
11.2
Symmetry of receiver
propagation delay rising trx_sym = trx_pdr – trx_pdf
edge minus falling edge
trx_pd
trx_sym
–2
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
15
4850A–AUTO–02/05
Figure 8-1.
Definition of Bus Timing Characteristics
tBit
tBit
tBit
TXD
(Input to transmitting Node)
tBus_dom(max)
tBus_rec(min)
Thresholds of
THRec(max)
receiving node 1
VS
(Transceiver supply
of transmitting node)
THDom(max)
LIN Bus Signal
Thresholds of
THRec(min)
receiving node 2
THDom(min)
tBus_dom(min)
tBus_rec(max)
RXD
(Output of receiving Node1)
trx_pdf(1)
trx_pdr(1)
RXD
(Output of receiving Node2)
trx_pdr(2)
16
trx_pdf(2)
ATA6620 [Preliminary]
4850A–AUTO–02/05
ATA6620 [Preliminary]
Figure 8-2.
Application Circuit
VCC
Microcontroller
RXD
5
ATA6620
VBAT
1
Normal
and
Pre-normal
Mode
Receiver
VS
22 µF
100 nF
4
LIN
LIN-BUS
Filter
220 pF
VCC
Wake Up Bus Timer
TXD
6
TXD
Time-out
Timer
Short-circuit and
Overtemperature
Protection
Slew Rate Control
8
EN
2
GND
3
Control
Unit
Normal Mode
Voltage Regulator
5V/50 mA
Sleep
Mode
VCC
Undervoltage Reset
Switched
Silent Mode
Off
Voltage Regulator
5V/10%
7
VCC
NRES
100 nF
22 µF
17
4850A–AUTO–02/05
9. Ordering Information
Extended Type Number
ATA6620-TAQY
Package
Remarks
SO8
LIN System Basis Chip
10. Package Information
Package SO8
Dimensions in mm
5.2
4.8
5.00
4.85
3.7
1.4
0.25
0.10
0.4
1.27
6.15
5.85
3.81
8
0.2
3.8
5
technical drawings
according to DIN
specifications
1
18
4
ATA6620 [Preliminary]
4850A–AUTO–02/05
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