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FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Table 15. Device Status
OD15
OD14
OD13
OD12
OD11
OD10
OD9
OD8
OD7
OD6
OD5
OD4
OD3
OD2
OD1
OD0
1
0
UVF
OTW
OTS
NM
0
OV
STOP_ IGN_ON FLASH
RC
STOP
FLASH IGN pin CLOCK
ON
ER_ON
pin
ER pin
fail
OD13 (UVF) = Under-voltage Flag on V BAT
OD12 (OTW) = Over-temperature Prewarning Flag
OD11 (OTS) = Over-temperature Flag for all outputs
OD10 (NM) = Normal mode
OD8 (Over-voltage) = Over-voltage Flag on V BAT in real time
OD7 = Indicates the state of internal STOP_ON signal, as described
in Figures 11
OD6 = Indicates the state of internal IGN_ON signal
OD5 = Indicates the state of internal FLASHER_ON signal
OD4 (RC) = Logic [0] indicates a Front Corner Light Switch. Logic [1]
indicates a Rear Corner Light Switch
OD3 (STOP pin) = Indicates the STOP pin state in real time
OD2 (FLASHER pin) = Indicates the FLASHER pin state in real time
OD1 (IGN pin) = Indicates the IGN pin state in real time
OD0 (CLOCK fail) = Logic [1], which indicates a clock failure
Previous Address SOA[1:0] = 11
If the previous two LSBs are 11, bits OD15 : OD0 reflect the
status of the 35XS3500 ( Table 15 ).
Table 16. Output Status
OD15
1
OD14
1
OD13
UVF
OD12
OTW
OD11
OTS
OD10
NM
OD9
0
OD8
0
OD7
X
OD6
X
OD5
X
OD4
OUT5
OD3
OUT4
OD2
OUT3
OD1
OUT2
OD0
OUT1
OD13 (UVF) = Under-voltage Flag on V BAT
OD12 (OTW) = Over-temperature Prewarning Flag
OD11 (OTS) = Over-temperature Flag for all outputs
OD10 (NM) = Normal mode
OD4 (OUT5) = Logic [0] indicates the OUT5 voltage is lower than
V OUT_TH . Logic [1] indicates the OUT5 voltage is higher than
V OUT_TH
Protection and Diagnosis
Output Protection Features
The 35XS3500 provides the following protection features:
? Protection against transients on V BAT supply line (per
ISO 7637)
? Active clamp, including protection against negative
transients on output line
? Over-temperature
? Severe and resistive over-current
? Open Load during ON state
These protections are provided for each output (OUT1:5).
Over-temperature detection
The 35XS3500 provides over-temperature shutdown for
each output (OUT1:OUT5 ). It can occur when the output pin
is in the ON or OFF state. An over-temperature fault condition
results in turning OFF the corresponding output. The fault is
OD3 (OUT4) = Logic [0] indicates the OUT4 voltage is lower than
V OUT_TH . Logic [1] indicates the OUT4 voltage is higher than V OUT_TH
OD2 (OUT3) = Logic [0] indicates the OUT3 voltage is lower than
V OUT_TH . Logic [1] indicates the OUT3 voltage is higher than V OUT_TH
OD1 (OUT2) = Logic [0] indicates the OUT2 voltage is lower than
V OUT_TH . Logic [1] indicates the OUT2 voltage is higher than V OUT_TH
OD0 (OUT1) = Logic [0] indicates the OUT5 voltage is lower than
V OUT_TH . Logic [1] indicates the OUT1 voltage is higher than V OUT_TH
latched and reported via the SPI. To delatch the fault and be
able to turn the outputs ON again, the failure condition must
be removed (T< 175 °C typically) and:
? if the device was in Normal mode, the output
corresponding register (bit D7) must be rewritten. ?
Application of the complete OCHI window
(OCHI1+OCHI2 during t2) depends on toggling or not
toggling D7 bit.
? if the device was in Fail mode, the corresponding output
is locked until device restart: wake up from Sleep mode
or V BATPOR1 .
The SPI fault report (OTS bit) is removed after a read
operation.
Over-current detections
The 35XS3500 provides intelligent over-current shutdown
(see Figure 12 ) in order to protect the internal power
transistors and the harness in the event of overload (fuse
characteristic).
35XS3500
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
31
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