PC33991DHSLASHR2 datasheet(30/36 Pages) MOTOROLA

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33991

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

POS1R

Move pointer to position 24 prior to RTZ.

Table 6

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.

- Bit PE12.

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 the 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 is used to enable or disable an RTZ.

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

Table 7

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.

Table 8

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 and 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

VELR

Change the maximum velocity of the gauge bits V8:V9. Determine which gauge(s) will

change the maximum velocity bits V7:V0. Determine the maximum velocity position from

the acceleration table.

Table 4

POS0R

Position Gauge 0 pointer

- Bits P0 11: P0 0: Desired Pointer Position.

Table 5

Check SO for Out of Range VPWR

- Bit ST6 logic level 1. Ifso, RTZafter valid VPWR.

Table 12

Check SO for Over Temperature bit ST0 logic level 1. If so, enable driver again. If ST0

continues to indicate Over Temperature, shut down Gauge 0. If ST2 returns to normal,

reestablish the zero reference by RTZ command.

POS1R

Position Gauge 1 pointer

- Bits P1 11:P1 0: Desired Pointer Position

Table 6

Check SO for Out of Range VPWR bit ST6 logic level 1. If so, RTZ after valid VPWR.

Table 12

Check SO for Over Temperature bit ST1 logic level 1. If so, enable driver again. If ST1

continues to indicate over temperature, shut down Gauge 1.

If ST1 returns to normal, reestablish the zero reference by RTZ command.

POS0R

a. Return the pointers close to zero position using POS0R

Table 5

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

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

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