PC33991DHSLASHR2 datasheet(31/36 Pages) MOTOROLA

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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

33991

POS1R

Return the pointers close to zero position using POS1R

Table 6

Move pointer position at least 24 microsteps CW to the nearest full step position prior to

RTZ.

Check SO to see if Gauge 0 has moved.

- Is bit ST4 logic level 1? If so, Gauge 0 has moved to the first microstep.

Table 12

PECR

Send null command to see if gauges have moved.

-BitsPE12

Table 3

Check SO to see if Gauge 0 (Gauge 1) has moved.

- Is bit ST4 (ST5) logic level 1? If so, Gauge 0 (Gauge 1) has moved another microstep.

Keep track of movement. If 24 steps are finished and both gauges are at a static

position, then RTZ. Otherwise repeat steps a) and b).

Table 12

RTZ

a. Return one gauge at a time to the zero stop using RTZ. Command bit RZ0 selects

the gauge bit RZ1 used to enable or disable an RTZ.

- Bits RZ3:RZ2 are used to select the RTZ accumulator bits clocking out on the SO pin.

Tables 7-8

b. Select the RTZ accumulator bits clocking out on the SO bits ST15:ST8. These will

be used if characterizing the RTZ.

- Bits RZ3:RZ2 are used to select the bits.

PECR

a. Check the status of the RTZ by sending the null command to monitor SO bit ST2

- Bit PE12 is the null command.

Table 3

Is ST2 logic level 0? If not, Gauge 0 is still returning. Null command should be resent.

Table 12

RTZ

Return the other Gauge to the zero stop. If the second gauge is driving a different pointer

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

Tables 7-8

PECR

a. Check the Status of the RTZ by sending the null command to monitor SO bit ST3

- Bit PE12 is the null command.

Table 3

Is ST3 logic level 0? If not, Gauge 1 is still returning. Null command should be resent.

Table 12

Disable both gauges and go to standby bit PE0:PE1 are used to disable the gauges

Table 3

Put the device to sleep.

-RST pin is pulled to logic 0.

Table 15. GDIC SETUP, CONFIGURATION, & USAGE EXAMPLE (continued)

Step

Number

Command

Description

Table/Figure

Number

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

PC33991DH/R2 Datasheet(PDF) 31 Page - Motorola, Inc

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