33970 datasheet(33/36 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33970

TYPICAL APPLICATIONS

INTRODUCTION

PECCR

(f) Send null command to see if gauges have moved

- Bits PE12

Table 7 (page 14),

Table 15 (page 19)

(g) Check SO to see if Gauge 0 (Gauge 1) moved

- Bit MOV0 (MOV1) logic [1]? If so, Gauge 0 (Gauge 1) moved another microstep. Keep

track of movement. If 12 steps are finished, and both gauges are at a static position, then

RTZ. Otherwise repeat steps (a) and (b)

- Bit CMD0 (OD10) (CMD1 (OD1)) could also be monitored to determine that the pointer is

static

RTZ

(a) Return one gauge at a time to the zero stop using RTZ command

- Bit RZ0 selects the gauge

- Bit RZ1 is used to enable or disable an RTZ

- Bit RZ2 is used to select the direction (along with PE7)

Table 7 (page 14),

Table 11 (page 16),

Table 16 (page 20)

(b) Select the RTZ accumulator bits clocking out on the SO bits using bits PE11:PE10. These

will be used if characterizing the RTZ

PECCR

(a) Check the status of the RTZ by sending the null command to monitor SO bit RTZ0

- Bit PE12 is the null command

Table 7 (page 14),

Table 15 (page 19)

(b) Is RTZ0 logic [0]? If not, Gauge 0 still returning and null command should be resent

RTZ

than the first, a new RTZCR command may be required to change the Full Step time

Table 11 (page 16),

Table 14 (page 18)

PECCR

(a) Check the status of the RTZ by sending the null command to monitor SO bit RTZ1

- Bit PE12 is the null command

Table 7 (page 14),

Table 15 (page 19)

(b) Is RTZ1 logic [0]? If not, Gauge 1 still returning and null command should be resent

Table 11 (page 16)

PECCR

(a) Disable both gauges and go to standby

- Bit PE0:PE1 are used to disable the gauges

Table 7 (page 14)

(b) Put the device to sleep

- RST pin is pulled to logic [0]

Table 22. 33970 Setup, Configuration, and Usage Example (continued)

Step

Command

Description

Reference Table

and or Figure

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