10XSC425 datasheet(33/56 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

10XSC425

6.2.2

Normal Mode

The 10XSC425 is in Normal mode when:

•VPWR and VDD are within the normal voltage range,

• wake-up = 1,

• fail = 0,

•fault = 0.

In this mode, the NM bit is set to lfault_contrologic [1] and the outputs HS[0:3] are under control, as defined by hson signal:

hson[x] = ( ( (IN[x] and DIR_dis[x]) or On bit[x] ) and PWM_en ) or (On bit [x] and Duty_cycle[x] and PWM_en).

In this mode and also in Fail-safe, the fault condition reset depends on fault_control signal, as defined by the following:

fault_control[x] = ( (IN_ON[x] and DIR_dis[x]) and PWM_en ) or (On bit [x]).

6.2.2.1

Programmable PWM Module

The outputs HS[0:3] are controlled by the programmable PWM module if PWM_en and the On bits are set to logic [1].

The clock frequency from IN0 input pin or from internal clock is the factor 27 (128) of the output PWM frequency (CLOCK_sel

bit). The outputs HS[0:3] can be controlled in the range of 5.0 to 98% with a resolution of seven bits of duty cycle (Table 7). The

state of other IN pin is ignored.

The timing includes seven programmable PWM switching delay (number of PWM clock rising edges) to improve overall EMC

behavior of the light module (Table 8).

The clock frequency from IN0 is permanently monitored in order to report a clock failure in case the frequency is out of the

specified frequency range (from fIN0(LOW) to fIN0(HIGH)). In case of a clock failure, no PWM feature is provided, the On bit defines

the outputs state and the CLOCK_fail bit reports [1].

Table 7. Output PWM Resolution

On bit

Duty cycle

Output state

OFF

0000000

PWM (1/128 duty cycle)

0000001

PWM (2/128 duty cycle)

0000010

PWM (3/128 duty cycle)

PWM ((n+1)/128 duty cycle)

1111111

fully ON

Table 8. Output PWM Switching Delay

Delay bits

Output delay

000

no delay

001

16 PWM clock periods

010

32 PWM clock periods

011

48 PWM clock periods

100

64 PWM clock periods

101

80 PWM clock periods

110

96 PWM clock periods

111

112 PWM clock periods

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