PC33814AE datasheet(28/50 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

33814

5.1.29 Manual and Automatic Modes

The SPI VRS miscellaneous configuration register has a bit to enable the automatic selection of the comparator threshold (bit 7).

At this time, the operation of automatic mode remains TBD.

5.1.30 VRS Peak Detector

The VRS peak detector determines the magnitude of the positive peak of the VRS input signal and digitizes it. The value of the

VRS peak voltage is reported in the VRS SPI status register bits 7, 6, 5, and 4. The MCU can read the value of peak voltage after

the zero crossing time of the input pulse, and uses this information to set the threshold and blanking parameters for subsequent

input pulses. Status bits reflect the last detected peak and only read 0000 after a POR or SPI reset command.

1000

1001

28.1

1010

31.3

1011

34.4

1100

37.5

1101

40.6

1110

43.8

1111

46.9

Table 12. Peak Detector Output in SPI VRS Status Register

SPI VRS Status Register

Bits 7,6,5,4

Peak Values (nominal)

0000

10 mV

0001

14 mV

0010

20 mV

0011

28 mV

0100

40 mV

0101

56 mV

0110

80 mV

0111

113 mV

1000

159 mV

1001

225 mV

1010

318 mV

1011

450 mV

1100

636 mV

1101

900 mV

1110

1.273 V

1111

1.800 V

Table 11. SPI VRS Manual Configuration Register

SPI VRS Configuration/Control

Blanking Time in%

(of last pulse high period)

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