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FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Sleep Mode
The Sleep mode is the default mode of the 35XS3500.
This is the state of the device after first applying battery
voltage (V BAT ) and prior to any I /O transitions. This is also the
state of the device when IGN, RST, FLASHER, and STOP
are logic [0]. In the Sleep mode, the output and all internal
circuitry are OFF to minimize current draw. In addition, all
SPI-configurable features of the device are reset. The
35XS3500 will transit to two modes (Normal and Fail)
depending on wake and fail signals (see Table 18 ).
The transition to the other modes is according to the
following signals:
? Wake = IGN or IGN_ON or FLASHER or
FLASHER_ON or STOP or STOP_ON or RST
? Fail = VCC fail or SPI fail or External limp
Normal Mode
The 35XS3500 is in Normal mode when:
? Wake = 1
? Fail = 0
I n Normal operating mode the power outputs are under full
control of the SPI as follows:
? The outputs 1 to 6, including multiphase timing, and
selectable slew-rate, are controlled by the
programmable PWM module.
? The output 4 is activated directly by the STOP external
pin in case the STOP_en bit is set to a logic [1].
? The outputs 1 to 5 are switched OFF in case of under-
voltage on VBAT.
? The outputs 1 to 5 are protected by the selectable over-
current double window and over-temperature shutdown
circuit.
? The digital diagnosis feature transfers status of the
The following figure describes the PWM, outputs and over-
current behavior in Normal mode.
D7 bit
D0-D6 bits
Output
Over-current
Fail Mode
The 35XS3500 is in Fail mode when:
? Wake = 1
? Fail = 1
In Fail mode:
? The outputs are under control of the external pins (see
Table 6 ).
? The outputs are fully protected in case of overload,
over-temperature and under-voltage (on B VAT or on
V CC ).
? The SPI reports continuously the content of address 11,
disregard to previous requested output data word.
? Neither digital diagnosis feature (SPI) nor analog
current sense are available.
? In case of overload (OCHI2 or OCLO) conditions or
under-voltage on VBAT, the outputs are under control
of the autorestart feature.
? In case of a serious overload condition (OCHI1 or OT)
the corresponding output is latched OFF until a new
wake-up event (wake = 0 then 1)
smart outputs via the SPI.
? The analog current sense output (current recopy
feature) can be rerouted by the SPI.
? The outputs can be configured to control LED loads:
R DS(ON) is increased by a factor of 2 and the current
recopy ratio is scaled by a factor of 4.
? The SPI reports NM=1 in this mode.
IGN_ON
IGN (external)
OUT[1,2]
Over-current
1.4 sec min
Table 7. Limp Home Output State
Output 1
Tail Light
IGN Pin
Output 2
License Light
OFF
Output 3
Rear Drive Light
OFF
Output 4
Stop Light
STOP Pin
Output 5
Flasher
FLASHER Pin
External Switch
Rear Fog Light
OFF
35XS3500
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
23
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