ATMEL ATA6842-PLQW Automotive failsafe system ic Datasheet

Features
• Driver Stages
– Four DMOS 150 mA Low-side Relay Drivers with Current Limitation
– One Gate Driver for External N-channel FET with Charge Pump and Bootstrap
– Two Universal Outputs (10 mA High Side and 60 mA Low Side)
– One 20 mA Warning Lamp Driver
• Power Supplies
– 5V/150 mA Linear Regulator
– 5V/30 mA Linear Regulator (also Active in Standby Mode)
– Internal Power Supply
– Switchable System Supply Voltage Output
• Monitoring and Protection
– 12V Monitoring
– Watchdog with Reset
– Two Comparators for Current Measurement
– Adjustable Undervoltage Warning Level
– Overtemperature Protection with Hysteresis
– Two 5V Comparators
– Wide Supply Voltage Range from 5.8V up to 26V
– 8-bit SPI Interface
– Low Current Consumption in Standby Mode 80 µA
– TTL and CMOS Compatible Inputs
– 2 kV ESD Protection
– Transient Protection According to ISO/TR 7637-1 Level 4 (Except Load Dump)
Automotive
Failsafe System
IC
ATA6842
Applications
As an Automotive Failsafe System IC, the ATA6842 is ideal for driver and monitoring
functions in ambitious solutions with increased safety requests such as parking
brakes, power steering, and other applications with DC motor control.
4964B–AUTO–07/07
1. Description
The ATA6842 is a monolithically-integrated multi-functional IC designed in Atmel ® ’s
state-of-the-art 0.8 µm BCDMOS technology. With its built-in driver stages, voltage supplies and
monitoring functions, it is an ideal cost saving failsafe system IC.
The communication with an external microcontroller is provided by an 8-bit SPI interface.
Four protected and current limited driver stages are available to control relays and additionally
there is a gate driver including charge pump and bootstrap to control an external FET.
Three LEDs for status information can be controlled via three separate outputs: The high-side
driver at pin OUTP has monitoring functions for overcurrent and current threshold. The low-side
drivers at the pins WLN and OUTN also have monitoring functions for overcurrent, current
threshold, and voltage monitoring.
Two internal bandgap references control and monitor two independent 5V supply voltages. In
standby mode the internal IC-supply is provided by one of them; the other one is switched off, in
order to reduce the power consumption to a minimum. All internal blocks are supplied by a specific internal voltage regulator.
The system supply voltage and all internally-generated voltages are monitored and in case of
over or undervoltage all drivers are switched off. Via the SPI the system supply voltage can be
switched to provide power for external components.
The car battery voltage (KL 30) is monitored by an adjustable monitoring function.
An oscillator with an external RC circuitry and a fully-integrated auxiliary oscillator which can be
set via the pin RREF are the clock references for the watchdog and all other time constants.
Both oscillators monitor each other.
The independent watchdog circuitry monitors the microcontroller’s correct operation.
Two differential amplifiers support the use of external A/D converters for current measurement.
Two comparators are provided to monitor the 5V supply of external devices like sensors.
The ATA6842 is the improved version and successor of the ATA6814. Pin and function compatible to it, the ATA6842 is the replacement in all applications. The ATA6842 offers a flawless
performance in reference to the requests of some automotive customers regarding very slow
supply voltage ramps ups and downs.
2
ATA6842
4964B–AUTO–07/07
ATA6842
Figure 1-1.
Block Diagram
WLP
UVM
UVR
UVW
V12
V12S
Battery
undervoltage
monitor
WLN
OUTN
OUTP
Universal
lowside
Driver
Universal
lowside
Driver
Universal
highside
driver
CtrL
CtrL
CtrL
12V Over/ CtrL
undervoltage
monitor
12V switch
BSC
TCFET
CtrL
Lowside
driver
RD1
CtrL
Lowside
driver
RD2
CtrL
Lowside
driver
RD3
CtrL
Lowside
driver
RD4
CtrL
ERD
CSN
DI
DO
CtrL
Highside
gate driver
with charge
pump
Control
Logic
8-Bit
SPI
(CtrL)
CLK
VRE
EK15
E5
VI
Enable
Internal
voltage
regulator
CtrL
Bandgap
reference
CtrL
Overtemperature
monitor
Current
measurement
comparator
B1CI
CtrL
Current
measurement
comparator
B2CI
B2CG
B2CO
CtrL
Voltage
monitoring
comparator 1
C1I
Voltage
monitoring
comparator 2
C2I
CtrL
CtrL
B5
V5
B5A
V5A
RCOS
Main
5V voltage
regulator
Voltage
monitoring
Auxiliary
5V voltage
regulator
CtrL
Fully integrated
main
oscillator
Bandgap
reference
IREF
Watchdog
oscillator
CtrL
CtrL
B1CG
B1CO
C1O
C2O
WDT
RSTN
RESAN
Watchdog
with reset
function
CtrL
Current bias
for all blocks
Test
RREF
TEST
RESN
A
L P
GND
3
4964B–AUTO–07/07
Figure 1-2.
Application Circuit
K30P
DK30
K30
CK30
K15ext
QU5
STD1802
47 µF
QU5A
BC817-40
K15
DWLN
DOUTN
ROUTP
2.7 kΩ
ROUTN
2.7 kΩ
DOUTP
100 nF
RUVM
510Ω
CV5
CV5A
10 µF
4.7 µF
WLN
V12 B5
V5
B5A V5A
CVI
RWLN
2.7 kΩ
WLP WLN
100 nF
DK15
VI
VI
OUTN
V12S
OUTP
BSC
TCFET
CBS1
UVM
47 nF
RUV1
1 kΩ
CBS2
RTC1
47 nF 10 kΩ
RTC2
10 kΩ
UVR
MTCFET1
RUV2
2.5 kΩ
UVW
VI
RL1
8.2Ω
RD1
RL1
ROS
100 kΩ
K30P
M M1
RCOS
COS
1 nF
RD2
MR12
RL2
µP
RL11
RREF
B1CI
RREF
10 kΩ
RL13
20 kΩ
1 kΩ
RL12
EK15
B1CG
µP
E5
RL14
20 kΩ
µP
WDT
RSTN
1 kΩ
MTCFET2
B1CO
µP
K30
ADC
µP
RL2
8.2Ω
RESAN
µP
RL15
0.01Ω
RD3
RL3
RESN
µP
CSN
K30P
µP
M M2
CLK
µP
DI
µP
DO
RD4
µP
MR34
µP
RL21
C1O
B2CI
µP
RL23
20 kΩ
C2O
µP
1 kΩ
RL25
0.01Ω
RL22
C2I
B2CG
µP
C1I
RL24
20 kΩ
µP
ERD
RL4
VRE
GNDA
GNDL
TEST GNDP
1 kΩ
B2CO
ADC
4
ATA6842
4964B–AUTO–07/07
ATA6842
2. Pin Configuration
Pinning QFN48
B2CG
B2CI
B2CO
B1CG
B1CI
B1CO
C20
GNDL
C10
VRE
DO
DI
Figure 2-1.
24 23 22 21 20 19 18 17 16 15 14 13
12
25
11
26
10
27
9
28
8
29
7
30
6
31
5
32
4
33
3
34
2
35
1
36
37 38 39 40 41 42 43 44 45 46 47 48
ATA6842
CLK
CSN
RCOS
E5
EK15
UVM
TEST
UVR
GNDA
RREF
RESN
RSTN
TCFET
BSC
VI
V5
B5
V5A
B5A
ERD
WLP
WDT
UVW
RESAN
C2I
OUTN
C1I
RD4
RD3
GNDP
RD2
RD1
V12S
V12
OUTP
WLN
Table 2-1.
Pin Description
Pin
Symbol
Function
1
RSTN
Reset input
2
RESN
Reset output
3
RREF
Reference resistor
4
GNDA
Analog ground
5
UVR
Undervoltage reference input
6
TEST
Test
7
UVM
Undervoltage measurement input
8
EK15
Enable (K15 based)
9
E5
Enable (5V based)
10
RCOS
11
CSN
Chip-select input
12
CLK
Clock input
13
DI
Data input
14
DO
Data output
15
VRE
External voltage regulator output
16
C1O
Comparator 1 output
17
GNDL
18
C2O
19
B1CO
Bridge 1 current output
20
B1CI
Bridge 1 current input
21
B1CG
Bridge 1 current ground
Resistor-capacitor oscillator
Logic ground
Comparator 2 output
5
4964B–AUTO–07/07
Table 2-1.
6
Pin Description (Continued)
Pin
Symbol
Function
22
B2CO
Bridge 2 current output
23
B2CI
Bridge 2 current input
24
B2CG
Bridge 2 current ground
25
C2I
26
OUTN
Comparator 2 input
Low-side driver output
27
C1I
Comparator 1 input
28
RD4
Relay driver 4 output
29
RD3
Relay driver 3 output
30
GNDP
31
RD2
Relay driver 2 output
32
RD1
Relay driver 1 output
33
V12S
12V switch
34
V12
35
OUTP
High-side driver output
36
WLN
Warning lamp output
37
TCFET
38
BSC
Bootstrap capacitor
39
VI
Internal 5V supply
40
V5
5V supply
41
B5
Base 5V supply
42
V5A
Auxiliary 5V supply
43
B5A
Base auxiliary 5V supply
44
ERD
Enable relay driver input
45
WLP
Warning lamp polarity input
46
WDT
Watchdog trigger input
47
UVW
48
RESAN
Power ground
12V supply voltage
Test current FET
Undervoltage warning output
Auxiliary reset output
ATA6842
4964B–AUTO–07/07
ATA6842
3. 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
Condition
Supply voltage
Symbol
Min.
Max.
Unit
V12
–0.3
+26
V
Supply voltage
t < 500 ms
V12
–0.3
+45
V
Voltage at pins CLK, DI, E5, ERD, WDT,
WLP, CSN, RSTN, VRE, DO, C1O, C2O,
RESN, RESAN, UVR, UVW, RREF, VI,
TEST, B1CI, B1CG, B1CO, B2CI, B2CG,
B2CO, RCOS
V() ≤ V5 + 0.3V
V()
–0.3
+5.5
V
Current in pins CLK, DI, E5, ERD, WDT,
WLP, CSN, RSTN, VRE, DO, C1O, C2O,
RESN, RESAN, UVR, UVW, RREF, VI,
TEST, B1CI, B1CG, B1CO, B2CI, B2CG,
B2CO, RCOS
I()
–10
+10
mA
Voltage at RD1, RD2, RD3, RD4, WLN,
OUTN, OUTP, EK15, BSC, TCFET, UVM
V()
–0.3
+45
V
Current in RD1, RD2, RD3, RD4, WLN,
OUTN
I()
–150
+150
mA
Current in OUTP
I()
–10
+10
mA
Voltage at V5, V5A
V()
–0.3
+5.5
V
Current in V5
I()
–150
+10
mA
Current in V5A
I()
–50
+10
mA
Voltage at V12S
V()
–0.3
+45
V
Current in V12S
I()
–60
+10
mA
2
kV
MIL-STD-883, Method 3015,
HBM 100 pF discharged
through 1.5 kΩ
Vd()
Operation
Tj,op
–40
+150
°C
Tj,peak
–40
+165
°C
Ts
–55
+125
°C
Symbol
Min.
Max.
Unit
Operating ambient temperature range
Tamb
–40
+105
°C
Thermal resistance, chip to case
RthJC
10
K/W
Tms
260
°C
ESD protection at all pins
Junction temperature
Peak
Storage temperature
4. Thermal Resistance
Parameters
Soldering temperature
Condition
7
4964B–AUTO–07/07
5. Electrical Characteristics
Operating conditions: V12 = 6.5V to 26V, V5 = 5V ±3%, RREF = 10 kΩ ±2%, Tj = –40°C to 150°C, unless otherwise specified.
No. Parameters
1
1.1
Test Conditions
Pin
Symbol
Min.
V12
6.5
5.8
Typ.
Max.
Unit Type*
Total Device
Permissible supply
voltage
All functions
Reduced operation mode(1)
1.2 Supply current
26
6.5
V
V
A
V12
I(V12)
10
mA
A
V12
I(V12)
80
µA
A
1.4 Leakage current low V() = 0V to V12, V12 = 14V
WLN, OUTN,
RD1 to RD4
Ilk()lo,stb
–1
+1
µA
A
V() = 0V to V12, V12 = 14V
V(BSC) = 14V
OUTP, V12S,
BSC
Ilk()hi,stb
–1
+1
µA
A
1.3 Supply current
1.5 Leakage current high
Standby, V12 = 14V,
I(V5A) = –10 µA
1.6 Supply current
All V5 based I/O pins open
1.7 Supply current
RESAN open
V5
I(V5)
0.5
mA
A
V5A
I(V5A)
50
µA
A
1.8 Pull-up current to V5 V() = 0.7 × V5
CSN
Ipu()
–100
–10
µA
A
1.9 Pull-up current to VI V() = 0.7 × VI
RSTN
Ipu()
–100
–10
µA
A
1.10 Pull-up current to V5 V() = 0V
CSN
Ipu()
–200
–20
µA
A
1.11 Pull-up current to VI V() = 0V
RSTN
Ipu()
–200
–20
µA
A
1.12 Pull-down current
V() = 0.2 × V5
CLK, DI, E5,
ERD, WDT
Ipd()
10
100
µA
A
1.13 Pull-down current
V() = 0.2 × VI
WLP
Ipd()
10
100
µA
A
1.14 Pull-down current
V() = V5
CLK, DI, E5,
ERD, WDT
Ipd()
20
200
µA
A
1.15 Pull-down current
V() = VI
WLP
Ipd()
20
200
µA
A
1.16 Pull-up voltage to V5
Vpu() = V() – V5,
I() = –10 µA
CSN
Vpu()
–0.6
V
A
1.17 Pull-up voltage to VI
Vpu() = V() – VI,
I() = –10 µA
RSTN
Vpu()
–0.6
V
A
1.18 Pull-down voltage
I() = 10 µA
CLK, DI, E5,
ERD, WDT, WLP
Vpd()
0.6
V
A
2
V
A
V
A
1
V
A
0.2
V
A
1.19
Input threshold
voltage high
CLK, CSN, DI,
E5, ERD, RSTN,
WDT, WLP
Vt()hi
1.20
Input threshold
voltage low
CLK, CSN, DI,
E5, ERD, RSTN,
WDT, WLP
Vt()lo
0.85
1.21
Input hysteresis
voltage
Vt()hys = Vt()hi – Vt()lo
CLK, CSN, DI,
E5, ERD, RSTN,
WDT, WLP
Vt()hys
0.2
1.22
Saturation voltage
low
I() = 0.1 mA, outputs low
C1O, C2O, VRE,
DO, RESAN,
RESN, UVW
Vs()lo
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
8
1. Reduced operation mode means either
- RDSON of drivers could be higher than specified or
- Voltage at pin TCFET could be beyond specified limits
ATA6842
4964B–AUTO–07/07
ATA6842
5. Electrical Characteristics (Continued)
Operating conditions: V12 = 6.5V to 26V, V5 = 5V ±3%, RREF = 10 kΩ ±2%, Tj = –40°C to 150°C, unless otherwise specified.
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit Type*
1.23
Saturation voltage
low
I() = 1.6 mA, outputs low
C1O, C2O, VRE,
DO, RESAN,
RESN, UVW
Vs()lo
0.4
V
A
1.24
Saturation voltage
high
Vs() = V5 – V(),
I() = –0.1 mA, outputs high
C1O, C2O, DO,
RESN, UVW
Vs()hi
0.5
V
A
1.25
Saturation voltage
high
Vs() = V5A – V(),
I() = –0.1 mA, RESAN high
RESAN
Vs()hi
0.5
V
A
1.26
Saturation voltage
high
Vs() = V5 – V(),
I() = –1.6 mA, outputs high
C1O, C2O, DO,
RESN, UVW
Vs()hi
1
V
A
1.27
Saturation voltage
high
Vs() = V5A – V(),
I() = –1.6 mA, RESAN high
RESAN
Vs()hi
1
V
A
1.28 Rise time
Cload = 10 pF,
V() from low = 10% ->
high = 90% V5
C1O, C2O, DO,
RESN, UVW
tr()
200
ns
B
1.29 Rise time
Cload = 10 pF,
V() from low = 10% ->
high = 90% V5A
RESAN
tr()
200
ns
B
1.30 Fall time
Cload = 10 pF,
V() from high = 90% ->
low = 10% V5
C1O, C2O, DO,
RESN, UVW
tf()
200
ns
B
1.31 Fall time
Cload = 10 pF,
V() from high = 90% ->
low = 10% V5A
RESAN
tf()
200
ns
B
1.32 Leakage current
DO = off, V() = 0V to V5
DO
I()lk
–10
+10
µA
A
C1O, C2O, DO,
RESN, UVW
Isc()lo
8
40
mA
A
RESAN
Isc()lo
8
40
mA
A
C1O, C2O, VRE,
DO, RESAN,
RESN, UVW
Isc()hi
–30
–8
mA
A
1.33
Short circuit current
low
V() = V5, pins = low
1.34
Short circuit current
low
V() = V5A, RESAN = low
1.35
Short circuit current
high
V() = 0V, pins = high
1.36
Saturation voltage
high
Vs() = VI – V(),
I() = –0.1 mA, VRE high
VRE
Vs()hi
0.5
V
A
1.37
Saturation voltage
high
Vs() = VI – V(),
I() = –1.6 mA, VRE high
VRE
Vs()hi
1
V
A
1.38
Short circuit current
low
V() = VI, VRE = low
VRE
Isc()lo
40
mA
A
1.39 Rise time
Cload = 10 pF,
V() from low = 10% ->
high = 90% VI
VRE
tr()
200
ns
B
1.40 Fall time
Cload = 10 pF,
V() from high = 90% ->
low = 10% VI
VRE
tf()
200
ns
B
8
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
1. Reduced operation mode means either
- RDSON of drivers could be higher than specified or
- Voltage at pin TCFET could be beyond specified limits
9
4964B–AUTO–07/07
5. Electrical Characteristics (Continued)
Operating conditions: V12 = 6.5V to 26V, V5 = 5V ±3%, RREF = 10 kΩ ±2%, Tj = –40°C to 150°C, unless otherwise specified.
No. Parameters
2
Pin
Symbol
Min.
Typ.
Max.
Unit Type*
RREF
V(RREF)
1.18
1.23
1.28
V
A
Bandgap, Bias
2.1 Voltage at RREF
3
Test Conditions
RREF = 10 kΩ ±2%
Temperature Monitoring
3.1
Thermal shutdown
temperature
Overcurrent in WLN, OUTN or
OUTP for t > 200 µs
T1off
120
145
°C
A
3.2
Thermal re-entry
temperature
Overcurrent in WLN, OUTN or
OUTP for t > 200 µs
T1on
105
135
°C
A
T1hys
5
20
°C
A
3.3 Thermal hysteresis 1 T1hys = T1off – T1on
3.4
Thermal shutdown
temperature
T2off
140
165
°C
A
3.5
Thermal re-entry
temperature
T2on
125
155
°C
A
T2hys
5
12
20
°C
A
60
100
150
kΩ
A
2.5
V
A
V
A
mV
A
3.6 Thermal hysteresis 2 T2hys = T2off – T2on
4
Enable/Standby
4.1 Input resistor
EK15
RiEK15
4.2
Upper enable
threshold
EK15
VEK15on
4.3
Lower enable
threshold
EK15
VEK15off
1.5
4.4 Enable hysteresis
EK15
VEK15hys
200
600
Enable time based
4.5 on watchdog
oscillator period
EK15
te(EK15)
1
6
4.8
5
A
V12 Voltage Monitoring
5.1
Lower undervoltage
threshold
V12
VtUlo
5.2
Upper undervoltage
threshold
V12
VtUhi
5.3
Undervoltage
hysteresis
V12
VtUhys
200
5.4
Lower overvoltage
threshold
V12
VtOlo
26
5.5
Upper overvoltage
threshold
V12
VtOhi
5.6
Overvoltage
hysteresis
V12
VtOhys
5.7
Under/overvoltage
filter time
V12
tfi
VtUhys = VtUhi – VtUlo
VtOhys = VtOhi – VtOlo
V
A
5.8
V
A
600
mV
A
V
A
32
V
A
0.5
1.8
V
A
50
100
µs
A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
10
1. Reduced operation mode means either
- RDSON of drivers could be higher than specified or
- Voltage at pin TCFET could be beyond specified limits
ATA6842
4964B–AUTO–07/07
ATA6842
5. Electrical Characteristics (Continued)
Operating conditions: V12 = 6.5V to 26V, V5 = 5V ±3%, RREF = 10 kΩ ±2%, Tj = –40°C to 150°C, unless otherwise specified.
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
6.1 Output voltage
I(V5) = –150 mA to 0 mA,
ß(NPN) > 120 mA,
Uce,sat(NPN) < 0.8V,
fT > 100 MHz
Ube(NPN) < 0.8V at –40°C,
Ube(NPN) < 0.7V at 27°C,
Ube(NPN) < 0.6V at 105°C
V5
V5
4.85
5
5.15
V
A
6.2 Line regulation
V12 = 8V to 18V,
I(V5) = –150 mA
V5
V5lir
–10
+10
mV
A
6.3 Load regulation
V12 = 14V,
I(V5) = –50 mA to –150 mA
V5
V5lor
–20
+20
mV
A
6.4 Allowed capacitor
V5
CV5
7
22
µF
C
6.5 Allowed capacitor
V5
ESR,CV5
0.5
10
Ω
C
RESN = low
V5
VtU(V5)low
4.5
V
A
V
A
V
A
5.5
V
A
6
Unit Type*
Linear Regulator
Lower threshold
6.6
undervoltage
6.7
Upper threshold
undervoltage
RESN = high
V5
VtU(V5)hig
h
6.8
Lower threshold
overvoltage
RESN = high
V5
VtO(V5)low
6.9
Upper threshold
overvoltage
RESN = low
V5
VtO(V5)hig
h
6.10
Hysteresis
Under/overvoltage
V5
Vt(V5)hys
50
200
mV
A
6.11
Under/overvoltage
filter time
V5
tfi(V5)
8
30
µs
A
4.8
5.2
6.12 Short circuit current
V(B5) = 0V
B5
Isc(B5)
1.5
8
mA
A
6.13 Pull-down resistor
V(B5) = 1V
B5
Rpd(B5)
50
250
kΩ
A
6.14 Pull-down current
V(B5) = 6V
B5
Ipd(B5)
10
50
µA
A
Vs(B5) = V12 – V(B5),
V12 = 5.8V to 6.5V,
I(B5) = –1.25 mA
Tj = –40°C
Tj = 27°C
Tj = 105°C
B5
Vs(B5)high
0.15
0.25
0.35
V
V
V
6.15
Saturation voltage
high
A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
1. Reduced operation mode means either
- RDSON of drivers could be higher than specified or
- Voltage at pin TCFET could be beyond specified limits
11
4964B–AUTO–07/07
5. Electrical Characteristics (Continued)
Operating conditions: V12 = 6.5V to 26V, V5 = 5V ±3%, RREF = 10 kΩ ±2%, Tj = –40°C to 150°C, unless otherwise specified.
No. Parameters
Pin
Symbol
Min.
Typ.
Max.
7.1 Output voltage
I(V5A) = –30 mA to 0 mA,
ß(NPN) > 200,
Uce,sat(NPN) < 1V,
Ube(NPN) < 0.8V at –40°C,
Ube(NPN) < 0.7V at 27°C,
Ube(NPN) < 0.6V at 105°C
V5A
V5A
4.65
5
5.35
V
A
7.2 Line regulation
V12 = 8V to 18V,
I(V5A) = –30 mA
V5A
V5Alir
–10
+10
mV
A
7.3 Load regulation
V12 = 14V,
I(V5A) = –10 mA to –30 mA
V5A
V5Alor
–20
+20
mV
A
7.4 Minimum capacitor
V5A
CV5A
3.3
10
µF
C
7.5 Minimum capacitor
V5A
ESR,V5A
0.5
10
Ω
C
4
V
A
V
A
V
A
6
V
A
7
Test Conditions
Unit Type*
V5A Auxiliary Linear Regulator
7.6
Lower threshold
undervoltage
RESAN = low
V5A
VtU(V5A)
low
7.7
Upper threshold
undervoltage
RESAN = high
V5A
VtU(V5A)
high
7.8
Lower threshold
overvoltage
RESAN = high
V5A
VtO(V5A)
low
7.9
Upper threshold
overvoltage
RESAN = low
V5A
VtO(V5A)
high
7.10
Hysteresis under/
overvoltage
V5A
Vt(V5A)
hys
50
200
mV
A
7.11
Under/overvoltage
filter time
Not in standby mode
V5A
tfi(V5A)
8
30
µs
A
7.12 Short circuit current
V(B5A) = 0V
B5A
Isc(B5A)
0.3
1.5
mA
A
7.13 Pull-down resistor
V(B5A) = 1V
B5A
Rpd(B5A)
50
250
kΩ
A
7.14 Pull-down current
V(B5A) = 6V
B5A
Ipd(B5A)
10
50
µA
A
Vs(B5A) = V12 – V(B5A),
V12 = 5.8V to 6.5V,
I(B5A) = –150 µA
Tj = –40°C
Tj = 27°C
Tj = 105°C
B5A
Vs(B5A)
hi
0.35
0.45
0.55
V
V
V
7.15
Saturation voltage
high
4.6
5.4
A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
12
1. Reduced operation mode means either
- RDSON of drivers could be higher than specified or
- Voltage at pin TCFET could be beyond specified limits
ATA6842
4964B–AUTO–07/07
ATA6842
5. Electrical Characteristics (Continued)
Operating conditions: V12 = 6.5V to 26V, V5 = 5V ±3%, RREF = 10 kΩ ±2%, Tj = –40°C to 150°C, unless otherwise specified.
No. Parameters
8
Test Conditions
Pin
Symbol
Min.
C(VI) = 100 nF,
I(VI) = –1 mA to 0 mA
VI
VI
4.35
3
Typ.
Max.
Unit Type*
Internal Voltage Supply VI
8.1 Output voltage
5.35
V
A
V
A
V
A
V
A
6
V
A
8.2
Lower threshold
undervoltage
RESN = low
VI
VtUlo
8.3
Upper threshold
undervoltage
RESN = high
VI
VtUhi
8.4
Lower threshold
overvoltage
RESN = high
VI
VtOlo
8.5
Upper threshold
overvoltage
RESN = low
VI
VtOhi
8.6
Hysteresis
undervoltage
VI
VtUhys
0.4
1
V
A
8.7
Hysteresis
overvoltage
VI
VtOhys
50
200
mV
A
VI
Isc()
20
150
mA
A
–10
+30
mV
A
100
mV
A
8.8 Short-circuit current
9
VI = 0V
4.3
5.4
Current Measurement, x = 1, 2
9.1 Output voltage low
I(BxCO) = 20 µA, BxCO = low
BxCO
Vs()lo
9.2 Saturation voltage
I(BxCO) = –750 µA,
BxCO = high,
Vs(BxCO)hi =
V5 – V(BxCO)
BxCO
Vs()hi
9.3
Short-circuit current
low
BxCO = low, V(BxCO) = V5
BxCO
Isc()lo
0.5
2
mA
A
9.4
Short-circuit current
high
BxCO = high,
V(BxCO) = 0V
BxCO
Isc()hi
–25
–2.5
mA
A
BxCO
Vos()
–3.5
–3
–3.5
+3.5
+3
+3.5
mV
mV
mV
BxCI
BxCG
Ilk()
–1.75
–0.25
µA
A
BxCI
BxCO
Vi()
–0.7
+0.35
V
A
B1CI, B1CG and
B2CI, B2CG
dIlk()
–0.25
+0.25
µA
A
Vos() = V(BxCI) – V(BxCG)
Input offset voltage
T = –40°C
9.5 V(BxCO) – (V(BxCI) j
Tj = 27°C
– V(BxCG))
Tj = 105°C
9.6 Leakage current
V(BxCI), V(BxCG) =
–0.7V to +0.35V
9.7 Input voltage range
9.8
V(BxCI), V(BxCG) =
Difference in leakage
–0.7V to +0.35V,
current
dIlk(BxCI, BxCG),
–1
A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
1. Reduced operation mode means either
- RDSON of drivers could be higher than specified or
- Voltage at pin TCFET could be beyond specified limits
13
4964B–AUTO–07/07
5. Electrical Characteristics (Continued)
Operating conditions: V12 = 6.5V to 26V, V5 = 5V ±3%, RREF = 10 kΩ ±2%, Tj = –40°C to 150°C, unless otherwise specified.
No. Parameters
Test Conditions
Pin
Symbol
Min.
I(RDx) = 150 mA, T < Toff
Tj = –40°C
Tj = 27°C
Tj = 105°C
RDx
Vs()lo
V(RDx) = 2V to V12,
T < Toff
RDx
Isc()lo
250
V(RDx) = 0V to 40V, T < Toff
RDx
Ilk()
I(RDx) = 10 mA,
RDx = high,
L = 0.2H
RDx
11.1 Upper window time
ROS = 100 kΩ ±1%,
COS = 1 nF ±5%
11.2 Lower window time
11.3 Watchdog timeout
Typ.
Max.
Unit Type*
10 Relay Driver RDx, x = 1 to 4
Saturation voltage
10.1
low
10.2
Short circuit current
low
10.3 Leakage current
10.4
Free-wheeling
voltage
0.4
0.5
0.6
V
V
V
400
mA
A
–5
+5
µA
A
Vf()
42
60
V
A
WDT
Tu(WDT)
22.2
24.6
27
ms
A
ROS = 100 kΩ ±1%,
COS = 1 nF ±5%
WDT
Tl(WDT)
16.4
18
19.8
ms
A
ROS = 100 kΩ ±1%,
COS = 1 nF ±5%
WDT
Tt(WDT)
59.7
64.6
71
ms
A
0.4
V
A
50
mA
A
12
mA
A
mA
A
300
A
11 Watchdog
12 Warning Lamp WLN
12.1
Saturation voltage
low
I(WLN) = 20 mA,
WLN = low
WLN
Vs()lo
12.2
Short-circuit current
low
V(WLN) = 1V to V12,
WLN = low
WLN
Isc()lo
12.3
Threshold current
high
WLN
Ith()hi
WLN
Ith()lo
8
12.4 Threshold current low
20
30
12.5
Hysteresis threshold
current
WLN
Ithhys
0.25
1.5
mA
A
12.6
Threshold voltage
detection
WLN
Vth()
2.25
2.75
V
A
12.7 Leakage current
V(WLN) = 0V to 40V,
WLN = high
WLN
Ilk()
–10
+10
µA
A
12.8 Overcurrent filter time
I(WLN) > Isc(WLN)lo,
T > T1off
WLN
tfi()
100
200
µs
A
12.9 Fall time
V(WLN) from
high = 90% -> low = 10% V12
WLN
tf()
10
µs
B
I(WLN) = 10 mA, WLN = high,
L = 10 µH
WLN
Vf()
60
V
A
12.10
Free-wheeling
voltage
42
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
14
1. Reduced operation mode means either
- RDSON of drivers could be higher than specified or
- Voltage at pin TCFET could be beyond specified limits
ATA6842
4964B–AUTO–07/07
ATA6842
5. Electrical Characteristics (Continued)
Operating conditions: V12 = 6.5V to 26V, V5 = 5V ±3%, RREF = 10 kΩ ±2%, Tj = –40°C to 150°C, unless otherwise specified.
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit Type*
13.1 Reset pulse duration
RESN
tl(RESN)
5.2
7.7
ms
A
13.2 Reset pulse duration
RESAN
tl(RESAN)
0.1
1
ms
A
1.2
V
A
120
mA
A
12
mA
A
mA
A
13 Reset
14 Low-side Driver OUTN
14.1
Saturation voltage
low
I(OUTN) = 60 mA,
OUTN = low, T < Toff
OUTN
Vs()lo
14.2
Short-circuit current
low
V(OUTN) = 2V to V12,
OUTN = low
OUTN
Isc()lo
14.3
Threshold current
high
OUTN
Ith()hi
14.4 Threshold current low
OUTN
Ith()lo
8
Hysteresis threshold
14.5
current
OUTN
Ithhys
0.25
1.5
mA
A
OUTN
Vth()
2.25
2.75
V
A
14.6
Threshold voltage
detection
60
90
14.7 Leakage current
V(OUTN) = 0V to 40V,
OUTN = high
OUTN
Ilk()
–10
+10
µA
A
14.8 Overcurrent filter time
I(OUTN) > Isc(OUTN)lo,
T > T1off
OUTN
tfi()
100
200
µs
A
14.9 Fall time
V(OUTN) from high = 90%
-> low = 10% V12
OUTN
tf()
10
µs
B
I(OUTN) = 10 mA,
OUTN = high, L = 10 µH
OUTN
Vf
60
V
A
Vs(OUTP) = V12 V(OUTP),
I(OUTP) = –10 mA,
OUTP = high, T < Toff
OUTP
Vs()hi
1
V
A
V(OUTP) = 0V to V12 – 2V,
OUTP = high
OUTP
Isc()hi
–25
–10
mA
A
OUTP
Ith()hi
–5
mA
A
OUTP
Ith()lo
–2
mA
A
OUTP
Ithhys
–1
–0.1
mA
A
14.10
Free wheeling
voltage
42
15 High-side Driver OUTP
15.1
Saturation voltage
high
15.2 Short-circuit current
15.3
Threshold current
high
15.4 Threshold current low
15.5
Hysteresis threshold
current
–15
15.6 Leakage current
V(OUTP) = 0V to V12, OUTP =
low
OUTP
Ilk()
–10
+10
µA
A
15.7 Overcurrent filter time
I(OUTP) > Isc(OUTP)hi,
T > T1off
OUTP
tfi()
100
200
µs
A
15.8 Rise time
V(OUTP) from low = 10%
-> high = 90% V12
OUTP
tr()
10
µs
B
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
1. Reduced operation mode means either
- RDSON of drivers could be higher than specified or
- Voltage at pin TCFET could be beyond specified limits
15
4964B–AUTO–07/07
5. Electrical Characteristics (Continued)
Operating conditions: V12 = 6.5V to 26V, V5 = 5V ±3%, RREF = 10 kΩ ±2%, Tj = –40°C to 150°C, unless otherwise specified.
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit Type*
ROS = 100 kΩ ±1%,
COS = 1 nF ±5%
RCOS
fOSC
9
10
11
kHz
A
No reset,
f – 1/(2 × ROS × COS)
RCOS
fOSC
0.9
55
kHz
A
16 Watchdog Oscillator RCOS
16.1 Oscillator frequency
16.2
Permissible
frequency range
16.3 Permissible resistor
COS = 1 nF
RCOS
ROS
20
100
kΩ
A
RCOS
COS
1
10
nF
A
V(RCOS) = VI
RCOS
Isc()lo
1
4
mA
A
V(RCOS) = 0% to 63.2% VI
RCOS
Ilk()
–5
+5
µA
A
fmosC
82.5
100
120
kHz
A
CxI
Vth(CxI)
1.1
1.23
1.4
V
A
–10
+10
µA
A
20
µs
B
16.4 Permissible capacitor ROS = 100 kΩ
16.5
Short-circuit current
low
16.6 Leakage current
17 Main Oscillator
17.1
Main oscillator
frequency
RREF = 10 kΩ ±2%
18 Comparator Cxl, x = 1, 2
18.1
Threshold voltage
detection
18.2 Leakage current
V(CxI) = 0V to V5
CxI
Ilk(CxI)
18.3 Propagation delay
dv/dt > 1V/µs
CxI
tpd(Cx)
TCFET
Vo()
4.5
10
V
A
1
25
mA
A
19 TCFET
19.1 Output voltage
Vo(TCFET) = V(TCFET) – V12,
V12 > 6.5V,
I(TCFET) = –20 µA to 0 µA
19.2
Short-circuit current
high
V(BSC) = 0V to V12 – 3V
BSC
Isc(BSC)hi
19.3
Saturation voltage
high
Vd() = V(BSC) – V(TCFET),
TCFET = high,
I(TCFET) = –20 µA
BSC
Vs()hi
1.5
V
A
19.4
Saturation voltage
low
TCFET = low,
I(TCFET) = 50 µA
TCFET
Vs()lo
200
mV
A
19.5
Short-circuit current
high
V(TCFET) = 0V,
TCFET = high
TCFET
Isc()hi
–250
–50
–25
µA
A
19.6
Short-circuit current
low
V(TCFET) = 2V to V12,
TCFET = low
TCFET
Isc()lo
100
150
200
µA
A
BSC
Ilk()
–10
+10
µA
A
19.7 Leakage current
V(BSC) = V12 to 36V,
TCFET = low
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
16
1. Reduced operation mode means either
- RDSON of drivers could be higher than specified or
- Voltage at pin TCFET could be beyond specified limits
ATA6842
4964B–AUTO–07/07
ATA6842
5. Electrical Characteristics (Continued)
Operating conditions: V12 = 6.5V to 26V, V5 = 5V ±3%, RREF = 10 kΩ ±2%, Tj = –40°C to 150°C, unless otherwise specified.
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit Type*
20 V12S Switch
20.1
Saturation voltage
high
Vs(V12S) = V12 – V(12S),
V12S = high, T < T2off, I(V12S)
= –60 mA
V12S
Vs()hi
0.36
20.2
Short-circuit current
high
V(V12S) = 0V to V12 – 2V,
V12S = high
V12S
Isc()hi
–150
V(V12S) = 0V to V12,
V12S = low
V12S
Ilk()
–10
UVM
Vir(UVR)
0.3 × V5
0.9 × V5
A
UVM
Vt(K30,
UVM)
2.9 ×
UVR
3.0 ×
UVR
3.1 ×
UVR
A
21.3 Input resistor
UVM
Ri(UVM)
60
100
150
Undervoltage
reference hysteresis
21.4
based on V(K30,
UVM)
UVM
Vt(UVR)
hys
0.02 ×
UVR
0.06 ×
UVR
UVR
Ilk(UVR)
–5
+5
µA
A
UVM
Ilk(UVM)
stb
–5
+5
µA
A
20.3 Leakage current
–90
1.2
V
A
–60
mA
A
+10
µA
A
21 UVM Voltage Monitoring
21.1 Input voltage range
Threshold on
21.2
V(K30, UVM)
21.5 Leakage current
21.6 Leakage current
R(K30, UVM) = 511Ω ±2%
V(UVR) = 0V to V5
V(UVM) = 0V to V12, standby
kΩ
A
A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note:
1. Reduced operation mode means either
- RDSON of drivers could be higher than specified or
- Voltage at pin TCFET could be beyond specified limits
6. Operating Conditions: SPI Interface
V12 = 5.8V to 26V; Tamb = –40°C to 105°C
Parameters
Symbol
Min.
Max.
Unit
12.5
µs
tcycle
0.5
Low cycle time
tcycle,lo
150
ns
High cycle time
tcycle,hi
150
ns
tsetup
100
ns
Cycle time
Setup time: DI stable before CLK high to low
thold
100
ns
Access time: DO stable after CLK high to low
taccess
100
ns
Valid time: DO stable before CLK high to low
tvalid
100
ns
Hold time: DI stable after CLK high to low
17
4964B–AUTO–07/07
7. Functional Description
7.1
Bandgaps
For voltage monitoring and as references for various voltage regulators, two independent bandgaps are used. The bandgaps for the generation and monitoring of the internal supply (V5 and
V5A) are used in cross-over mode.
7.2
Bias
The external resistor at RREF defines a current reference for all blocks and determines main
oscillator frequency. The current through the external resistor is monitored and in case of malfunction (pin open or short to ground; current is less than 0.25 times or greater than 8 times
nominal value), a bias failure is detected (see Table 7-9 on page 25).
7.3
Temperature Monitoring
To protect the circuit from extensive temperature in error condition, two temperature levels are
implemented to switch off various blocks. At the lower temperature level, the outputs WLN,
OUTN or OUTP are switched off after a debounce time, if the corresponding driver is in current
limitation.
The Warning Lamp is switched on above the upper temperature level. All other drivers and the
linear regulators will switch off. If the temperature level falls below the shutdown temperature
(hysteresis), all drivers except TCFET and the relay drivers will go to their previous state.
7.4
Enable/Standby
The power consumption of ATA6842 is reduced to a minimum via inputs E5 or EK15 (sleep
mode). With the signal TEN via SPI command, the inputs E5 and EK15 can be overwritten and
the ATA6842 will stay active (keep-alive function). The status of EK15 can be read via SPI.
Table 7-1.
E5
7.5
Enable/Standby Table
EK15
TEN (SPI)
ATA6842
High
x
x
Active
x
High
x
Active
Low
Low
High
Active
Low
Low
Low
Standby
V12 Voltage Monitoring
The system supply is checked for overvoltage and undervoltage at the internal voltage divider. If
the voltage exceeds the limits, the drivers are switched off and a reset at RESN and RESAN is
generated (see Table 7-9 on page 25).
18
ATA6842
4964B–AUTO–07/07
ATA6842
7.6
5V Linear Regulators
The ATA6842 offers two independent 5V supplies. The main supply (V5) is available only in
active mode while the auxiliary 5V supply (V5A) is active all the time. The ATA6842 activates the
basis of external bipolar transistors via pins B5 and B5A. The currents of the regulators V5
(150 mA) and V5A (30 mA), defined in the datasheet, can only be achieved if the external transistors fulfil certain requirements in terms of current amplification and transit frequency.
Especially for V12 = 5.8V a low saturation voltage of B5 and B5A in combination with the forward
diode voltage and a low saturation voltage (Uce,sat) of the external bipolar transistors is
required. For fast load changes at V5 a high transit frequency is necessary (typically
fT > 100 MHz).
For voltage monitoring and as references for the voltage regulators two independent bandgaps
are used. The voltage monitoring functions of V5 and V5A generate a reset pulse at RESN and
RESAN if the limits are exceeded (see Table 7-9 on page 25). For internal voltage supply, an
additional linear regulator (VI) is implemented.
7.7
Current Measurement
The ATA6842 contains two differential amplifiers for current measurement. The input signal of
each amplifier is a voltage drop over an external current sense resistor. The amplification,
defined by the ratio of external resistors, provides a reasonable signal for the following A/D converter. The output is limited to V5.
7.8
Relay Driver
The ATA6842 features four current-limited relay drivers for motor direction control relays. The
relays are controlled by an SPI command and the input of the enable relay driver (ERD). Error
conditions disable the relays permanently (see Table 7-9 on page 25).
Table 7-2.
TRD1 (SPI)
TRD2 (SPI)
ERD
RD1
RD2
Low
Low
x
Open drain
Open drain
Low
High
High
Open drain
Low
High
Low
High
Low
Open drain
High
High
High
Open drain
Open drain
x
x
Low
Open drain
Open drain
Table 7-3.
Note:
Relay Status Table
Relay Status Table
TRD3 (SPI)
TRD4 (SPI)
ERD
RD3
RD4
Low
Low
x
Open drain
Open drain
Low
High
High
Open drain
Low
High
Low
High
Low
Open drain
High
High
High
Open drain
Open drain
x
x
Low
Open drain
Open drain
The simultaneous activation of the relay drivers RD1 and RD4 or RD2 and RD3 is not possible
(see Table 7-2 and Table 7-3). This feature ensures that if ATA6842 is used in DC motor application, the motors can only operate in the same direction.
19
4964B–AUTO–07/07
7.9
Watchdog
The open loop watchdog (window comparator) compares each time interval between a falling
and a rising edge with a given reference time interval. The lower window time is between
90 × t WD and 91 × t WD and the upper window time is between 122 × t WD and 123 × t WD
(tWD = 2/fOSC). The watchdog includes an error counter WDC(2:0) which is incremented by one
when there are valid trigger events and decremented by three when there are watchdog errors.
If the counter reaches a value of zero (state S0: 000), the warning lamp will be switched on.
Relay drivers, TCFET-, low- and high-side drivers are disabled. With a counter value greater
than or equal to seven (state S7: 111), the watchdog stops affecting the drivers. In the case of a
watchdog timeout (322 × tWD to 323 × tWD), the error counter is immediately set to zero. The initial state of the watchdog counter after power-up or if RESN is low is 110 (state S6). The
watchdog can be reset by RSTN.
Figure 7-1.
State Diagram
S1
001
good
bad
S2
010
bad | timeout
good
good
bad | timeout
good
bad
S3
011
bad | timeout
S0
000
timeout
good
S7
111
timeout
timeout
good
timeout
bad
S4
100
S6
110
good
S5
101
good
bad
bad
20
ATA6842
4964B–AUTO–07/07
ATA6842
7.10
Warning Lamp
The ATA6842 features a watchdog-controlled output, WLN, which can be used to switch a warning lamp. Depending on the warning lamp polarity pin (WLP), the warning lamp output is
switched either to low level or to open drain, when a Warning lamp request (that is, On in Table
7-9 on page 25, column WLN) occurs or the corresponding SPI command is transmitted. For the
behavior of WLN output refer to Table 7-4. The driver is short-circuit proof and will switch off
after a debounce time. An activation of the warning lamp due to Warning lamp request is suppressed for 768 × tWD after wake-up to avoid a flickering of the warning lamp during the start-up
phase (exception: lower thermal threshold level reached). The driver also has a current sensor
and a voltage monitoring which sets SPI flags if the corresponding thresholds are reached.
Warnlamp is open drain during suppression time after wake-up. If the oscillator does not work
4 ms after start up, the internal oscillator watchdog timeout is reached and the warning lamp is
switched on.
Table 7-4.
TWLN (SPI)
Overcurrent
in WLN
Occurred
Thermal
Threshold #1
Reached
Suppression Time
After
Wake-up/VI Reset
V12
WLP
WLN
Yes
x
x
No
t < 768 × tWD
> 4.8V
Low
Open drain
Yes
x
x
No
t > 768 × tWD
> 4.8V
Low
Low
Yes
x
No
Yes
t < 768 × tWD
> 4.8V
Low
Open drain
Yes
x
No
Yes
t > 768 × tWD
> 4.8V
Low
Low
No
High
x
No
t > 768 × tWD
> 4.8V
Low
Low
No
Low
x
No
x
> 4.8V
Low
Open drain
Yes
x
Yes
Yes
x
> 4.8V
Low
Open drain
Yes
x
x
No
x
> 4.8V
High
Open drain
Yes
x
No
Yes
x
> 4.8V
High
Open drain
No
High
x
No
t > 768 × tWD
> 4.8V
High
Low
Warnlamp
Request
7.11
Warning Lamp Status Table
No
Low
x
No
x
> 4.8V
High
Open drain
No
High
Yes
Yes
x
> 4.8V
High
Open drain
No
High
No
Yes
x
> 4.8V
x
Open drain
x
x
x
x
x
< 4.8V
x
Open drain
Reset
When V12, VI, V5 or V5A are beyond their corresponding normal operating range or the temperature has reached the upper temperature level, a reset is indicated at the outputs RESN
(640 × tmos; tmos = 1/fmos) and RESAN. Additionally, RESAN can be activated by an SPI command. Via input RSTN, the SPI Interface and the watchdog can be reset by an external signal
(see Table 7-9 on page 25).
21
4964B–AUTO–07/07
7.12
SPI Interface
The ATA6842 supports an 8-bit SPI interface to communicate with the microprocessor. The
MSB is transmitted first. There are two status registers (address 0xxxxx01 and 0xxxxx10) and
two control registers (address 1xxxxx01 and 1xxxxx10).
Table 7-5.
Name
Meaning
Function
7
C1O
Comparator 1 output
0: comparator C1I below threshold
1: comparator C1I above threshold
6
EK15S
EK15 status
0: EK15 below threshold
1: EK15 above threshold
5
WLPS
Warnlamp polarity status
0: pin WLP = low
1: pin WLP = high
4
OTS
Overtemperature status
0: normal operation
1: overtemperature present or
overtemperature detection switched off
3
WDOK
Watchdog status
0: watchdog OK
1: watchdog failure
2:0
WDC(2:0)
Watchdog counter bit 2:0
Status of watchdog counter
Table 7-6.
22
Status Register 0xxxxx01 Request by Microprocessor
Bit
Status Register 0xxxxx10 Request by Microprocessor
Bit
Name
Meaning
Function
7
WLNOC
Warnlamp overcurrent
0: no overcurrent
1: overcurrent
6
ONOC
OUTN overcurrent
0: no overcurrent
1: overcurrent
5
OPOC
OUTP overcurrent
0: no overcurrent
1: overcurrent
4
WLNCS
Warnlamp current status
0: current below threshold
1: current above threshold
3
ONCS
OUTN current status
0: current below threshold
1: current above threshold
2
OPCS
OUTP current status
0: current below threshold
1: current above threshold
1
WLNVS
Warnlamp voltage status
0: voltage below threshold
1: voltage above threshold
0
ONVS
OUTN voltage status
0: voltage below threshold
1: voltage above threshold
ATA6842
4964B–AUTO–07/07
ATA6842
Table 7-7.
Bit
Control Register 1xxxxx01 Sent by Microprocessor
Name
Meaning
Function
Comment
7
TWLN
Trigger warning
lamp
0: WLN = off
1: WLN = on
See Table 7-4 on page 21
and Table 7-9 on page 25
6
TOUTN
Trigger OUTN
0: OUTN = off
1: OUTN = on
See Table 7-10 and Table
7-11 on page 26
5
TOUTP
Trigger OUTP
0: OUTP = off
1: OUTP = on
See Table 7-10 and Table
7-11 on page 26
4
TEN
Trigger enable
(keep alive)
0: no keep alive
1: keep alive
See Table 7-1 on page 18
3
TV12S
Trigger V12
switch
0: V12S = off
1: V12S = V12
Used in Testmode 3
see Table 7-9 on page 25
2
TUVR
Trigger
undervoltage
reference
0: if UVM < 3 × UVR => UVW = low
0: if UVM > 3 × UVR => UVW = high
1: UVW = low
1
–
0
OTDE
Note:
–
–
Overtemperature 0: temperature detection off
detection enable 1: temperature detection on
No function
Set OTS = high
if overtemperature =>
OTS = high, else low
Bold: default state after reset by RSTN = low
Table 7-8.
Control Register 1xxxxx10 Sent by Microprocessor
Bit
Name
Meaning
Function
Comment
7
TTCFET
Trigger test
current FET
0: TCFET = off
1: TCFET = on
See Table 7-9 on page 25
6
TRESAN
Trigger RESAN
0: default
1: RESAN = reset (low)
5
–
4
TRD4
Trigger relay
driver 4
0: RD4 = off
1: RD4 = on if RD3 = off
3
TRD3
Trigger relay
driver 3
0: RD3 = off
1: RD3 = on if RD4 = off
2
TRD2
Trigger relay
driver 2
0: RD2 = off
1: RD2 = on if RD1 = off
1
TRD1
Trigger relay
driver 1
0: RD1 = off
1: RD1 = on if RD2 = off
0
Note:
–
–
–
–
Bold: default state after reset by RSTN = low
–
No function
See Table 7-2 on page 19,
Table 7-3 on page 19 and
Table 7-9 on page 25
No function
For operation of SPI communication see the following timing diagrams (see Figure 7-2 and Figure 7-3 on page 24).
With a low signal at CSN, the ATA6842 will be selected for communication by the microprocessor. With clock pulses at CLK, the address and data transfer will be synchronized. DI is the input
for address and data from the microprocessor to ATA6842. The data must be valid at the falling
edge of the CLK pin. DO transfers data from ATA6842 to the microprocessor.
23
4964B–AUTO–07/07
The request command structure (to read a status register of ATA6842) consists of a two-byte
transmission. The control command structure (to write a control register of ATA6842) consists of
a three-byte transmission with eight clock pulses each and a low/high transition at CSN. The first
byte is for identification.
All request command ID bytes shall have a “0” in their most significant bit. The address is transmitted by the last two bits. In the second byte (which can be a dummy byte (0x00) or next
command), the status register corresponding to the address of the first byte will be sent by DO.
At start-up, the returned value when the first command is sent will be zero (no 'last command'
available).
Figure 7-2.
Request Command Structure (Read Register)
CSN
CLK
DI
0
X
X
X
X
DO
X
ADR1
ADR0
0
X
X
X
X
X
ADR1 ADR0
DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0
All control command ID bytes shall have a “1” in their most significant bit. The address is transmitted by the last two bits. The second byte is the data byte which contains the control data for
the send command.
With the second low to high transition of CSN the data is stored in ATA6842.
The SPI logic monitors for faulty communication. To check which data is received at ATA6842 in
the second and third clock cycle, the address and data are sent back to the microprocessor and
tested to verify that the transmission was correct. The first data byte at DO is the response byte
of the last command while the third DI byte is the address for the next data. If there is no next
command, the address can be set to 0x00.
Figure 7-3.
Control Command Structure (Write Register)
CSN
CLK
DI
1
X
X
X
DO
X
X
ADR1
ADR0
DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1
DATA0
ADR7 ADR6 ADR5 ADR4 ADR3 ADR2 ADR1 ADR0
ADR7
ADR1
ADR0
DATA7
DATA1 DATA0
The 8 CLK pulses must be received when CSN is triggered, otherwise the address and/or data
will be ignored and zeros will be returned on DO.
The minimum time for receiving during CSN = low is t ≤ 100 µs; otherwise, a timeout expires and
the receiving is stopped. Any received data is ignored. Therefore, the minimum clock frequency
is 80 kHz for SPI transmission.
24
ATA6842
4964B–AUTO–07/07
ATA6842
7.13
External Voltage Regulator VRE
The ATA6842 can control an external voltage regulator with enable input. The VRE output provides the same logic as for the V5 regulator (see Table 7-9). For V5 voltage monitoring, the
external generated voltage must be connected to V5.
Table 7-9.
Logic Table
Event
VI
V5
VRE
V5A
SPI
Info
WLN
RD1 to
RD4
RESN
RESAN
V12S
OUTx
x = N,P
TCFET
Standby
Off
Off
On
–
Off
Off
–
No reset
Off
Off
Off
V12 undervoltage
On
Off
Off
No
Off
Off
Reset
Reset
Off
Off
Off
VI undervoltage
On
Off
On
No
Off
Off
Reset
No reset
Off
Off
Off
VI overvoltage
On
Off
On
No
On
Off
Reset
No reset
Off
Off
Off
Oscillator/bias failure
On
Off
Off
No
On
Off
Reset
Reset
Off
Off
Off
V12 overvoltage
On
Off
Off
No
On
Off
Reset
Reset
Off
Off
Off
Off
Off
(4)
Off
Reset
Reset
On
Off
No reset
No reset
Off
Off
Off
On
Off
Reset
No reset
Off
Off
Off
On
Off
No reset
Reset
Off
Off
Off
Yes
Off(1)
On/Off
No reset
No reset
On/Off
On/Off
On/Off
On
Yes
Off
On/Off
No reset
No reset
On/Off
On/Off(1)
On/Off
On
Yes
On
Off
No reset
No reset
On/Off
Off
Off
Temp
Perm
Upper thermal threshold On
On
On
Yes
Reset by RSTN
On
On
On
No
V5 out of range
On
On
On
No
V5A out of range
On
On
On
No
Short circuit WLN
(overcurrent)
On
On
On
Short circuit OUTx
(overcurrent)
On
On
Watchdog error
On
On
On
(3)
–
Off mode
–
–
–
–
–
Perm
Note:
1. Corresponding driver is switched off if thermal threshold number 1 is reached
–
Off
(5)
(2)
Temp
2. Temp = temporary state, recovery when event condition is removed, except VI out of over-/undervoltage, thermal threshold
number 2 reached or reset by RSTN
3. Perm = permanent state, no recovery when event condition is removed, must be re-engaged by SPI command
4. If no overcurrent in WLN
5. Not testable
25
4964B–AUTO–07/07
7.14
Low-/High-side Driver
ATA6842 features two multipurpose outputs, a low-side driver OUTN and a high-side driver
OUTP. Both drivers are controlled via SPI and are short-circuit proof (they will switch off after a
debounce time if a short circuit is detected). During a short-circuit condition the corresponding
SPI flag is set. The drivers are disabled by a watchdog error or during the reset phase. Both drivers also have an current sensor and OUTN has a voltage monitor which sets SPI flags if the
corresponding thresholds are reached.
Table 7-10.
Logic Table for Low-side Driver
TOUTN (SPI)
Overcurrent and
Thermal Threshold
Number 1 Reached
Watchdog
OUTN
High
No
OK
Low
Low
No
OK
Open drain
x
No
Error
Open drain
x
Yes
x
Open drain
TOUTP (SPI)
Overcurrent and
Thermal Threshold
Number 1 Reached
Watchdog
OUTP
High
No
OK
High
Low
No
OK
Open drain
x
No
Error
Open drain
x
Yes
x
Open drain
Table 7-11.
7.15
Logic Table for High-side Driver
Oscillators
The watchdog oscillator provides an internal frequency of fWD = 5 kHz ±10% given by external
components.
ROS = 100 kΩ ±1% and COS = 1 nF ±5% for the watchdog. For failsafe reasons, the clock frequency is internally monitored by an oscillator with RREF = 10 kΩ running at
fOSC = 100 kHz ±20%. This oscillator determines all other time constants. The watchdog oscillator frequency can be adjusted by a factor of five with the components ROS and COS according to
the formula: fWD = 1/tWD where
0.632 × VI
⎞
t WD = 2 × R OS × C OS × ⎛⎝ 1 + -----------------------------------------------------------I × R – 0.684 × VI⎠
SC
OS
The first term describes charging the external RC, and the second term describes discharging.
With ROS = 100 kΩ and COS = 1 nF the period of RCOS will result to typically
tosc = 100 × (1 + 0.012) µs.
fWD is half of the frequency measured externally at the RCOS pin.
An oscillator failure generated by the oscillator watchdog occurs if the period of RCOS is smaller
than tOSC or greater than 200 × tOSC, fOSC = 1/tOSC.
For oscillator failure, see Table 7-9 on page 25.
26
ATA6842
4964B–AUTO–07/07
ATA6842
7.16
12V Switch
Via an SPI command, the voltage at pin V12 can be switched to pin V12S (see Table 7-9 on
page 25). The 12V switch has a current limitation.
7.17
Comparator
The ATA6842 has two comparators. They compare inputs CxI in reference to the bandgap voltage. There are no internal pull-ups or pull-downs. The output is a V5-based push-pull stage. A
hysteresis can be implemented by external resistors. Additionally, the output of comparator
number 1 can be read out via SPI.
7.18
TCFET Driver
The ATA6842 features a circuit to drive an external N-channel FET. The control voltage is generated by a charge pump with bootstrap circuit for faster power-up behavior. Activation is done
by an SPI command (see Table 7-9 on page 25).
7.19
UVM Voltage Monitoring
An undervoltage warning is indicated at output UVW if V12 falls below 3 × UVR. This referencevoltage level can be adjusted by an external resistor divider. The undervoltage warning can be
tested with an SPI command.
27
4964B–AUTO–07/07
8. Ordering Information
Extended Type Number
Package
Remarks
ATA6842-PLSW
QFN48
Tube, lead-free
ATA6842-PLQW
QFN48
Taped and reeled, lead-free
9. Package Information
Package: QFN 48 - 7 x 7
Exposed pad 4.5 x 4.5
(acc. JEDEC OUTLINE No. MO-220)
Dimensions in mm
7
Not indicated tolerances ± 0.05
1 max.
5.5
+0
0.05-0.05
4.5
37
48
1
48
1
36
technical drawings
according to DIN
specifications
0.4±0.1
25
0.23
12
12
24
13
0.5 nom.
Drawing-No.: 6.543-5089.01-4
Issue: 2; 24.01.03
28
ATA6842
4964B–AUTO–07/07
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4964B–AUTO–07/07
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