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FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 35XS3500 is designed for low-voltage automotive and
industrial lighting applications. Its five low R DS(ON) MOSFETs
(five 35 m ? ) can control the high sides of five separate
resistive loads (bulbs). Programming, control, and
diagnostics are accomplished using a 16-bit SPI interface.
FUNCTIONAL PIN DESCRIPTION
Supply Voltage (VBAT)
The VBAT pin of the 35XS3500 is the power supply of the
device. In addition to its supply function, this tab contributes
The amplitude of the input current is divided by four while
the frequency is four times the original one. The two following
pictures illustrate the behavior.
to the thermal behavior of the device by conducting the heat
from the switching MOSFETs to the printed circuit board.
Ch.1
Supply Voltage (VCC)
This is an external voltage input pin used to supply the SPI
digital portion of the circuit and the gate driver of the external
Ch.2
Ch.3
Ch.4
SMART MOSFET.
Total
Ground (GND)
This pin is the ground of the device.
0°
90°
180°
270°
0°
Clock Input (CLOCK) and PWM Module
When the part is in Normal Mode (RST=1), the PWM
frequency and timing are generated from the rising edge of
clock input by the PWM module. The clock input frequency is
the selectable factor 2 7 = 128 or 2 8 = 256 of the PWM
frequency per output, depending PR bit value.
The OUT1:6 can be controlled in the range of 4% to 96%
with a resolution of 7 bits of duty cycle (bits D[6:0]).
The following table describes the PWM resolution.
Ch.1
Ch.2
Ch.3
Ch.4
Total
On/Off (Bit
D7)
0
1
1
1
1
Duty cycle (7 bits
resolution)
X
0000000
0000001
0000010
1111111
Output state
OFF
PWM (1/128 duty cycle)
PWM (2/128 duty cycle)
PWM (3/128 duty cycle)
fully ON
0° 90° 180° 270° 0°
The synchronization of the switching phases between
different corner light IC is provided by a SPI command in
combination with the CS input. The bit in the SPI is called
PWM sync (initialization register).
In Normal mode, No PWM feature (100% duty cycle) is
provided in the following instances:
? with the following SPI configuration: D7:D0=FF.
Table 6. PWM Resolution
The timing includes four programmable PWM switching
phases (0°, 90°, 180°, and 270°) to improve overall EMC
behavior of the light module.
? In case of clock input signal failure (out of f PWM ), the
outputs state depends on the D7 bit value (D7=1+ON)
in Normal mode.
In Fail mode. The outputs state depends on the IGN,
STOP and Flasher pins.
If RST=0, this pin reports the wake-up event for wake=1
when VBAT and VCC are in operational voltage range.
35XS3500
Analog Integrated Circuit Device Data ?
20
Freescale Semiconductor
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