33975A_14 데이터 시트보기 (PDF) - Freescale Semiconductor

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33975A_14

Multiple Switch Detection Interface with Suppressed Wake-up and 32 mA Wetting Current

Freescale Semiconductor 

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

Table 12. Analog Channel

Bits 43210

Analog Channel Select

00000

00001

00010

00011

00100

00101

00110

00111

01000

01001

01010

01011

01100

01101

01110

01111

10000

10001

10010

10011

10100

10101

10110

No Input Selected

SG0

SG1

SG2

SG3

SG4

SG5

SG6

SG7

SG8

SG9

SG10

SG11

SG12

SG13

SP0

SP1

SP2

SP3

SP4

SP5

SP6

SP7

CALIBRATION OF TIMERS

In cases where an accurate time base is required, the user

may calibrate the internal timers using the calibration

command (refer to Table 13). After the 33975 device

receives the calibration command, the device expects 512 s

logic [0] calibration pulse on the CS pin. The pulse is used to

calibrate the internal clock. No other SPI pins should

transition during this 512 s calibration pulse. Because the

oscillator frequency changes with temperature, calibration is

required for an accurate time base. Calibrating the timers has

no affect on the quiescent current measurement. The

calibration command simply makes the time base more

accurate. The calibration command may be used to update

the device on a periodic basis. All reset conditions clear the

calibration register and places the device in the uncalibrated

state.

Table 13. Calibration Command

Calibration Command

Command Bits

23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

0 0 0 0 1 0 1 1XXXXXXXXXXXXXXXX

RESET

The reset command resets all registers to Power-ON Reset

(POR) state. Refer to Table , page 20, for POR states or the

paragraph entitled Power-ON Reset (POR) on page 16 of

this datasheet.

Analog Integrated Circuit Device Data

Freescale Semiconductor

33975

19

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