33970 datasheet(32/36 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33970

TYPICAL APPLICATIONS

INTRODUCTION

PECCR

(a) Check the Status of the RTZ by sending the null command to monitor SO bit RTZ0, RTZ1

of Device Status SO

Bit PE12 is the null command

Table 7 (page 14),

Table 15 (page 19)

(b) Is RTZ0 (OD2) logic [0]? If not, Gauge 0 still returning and null command should be

resent.

RTZ

(a) 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.

Table 11 (page 16)

PECCR

(a) Check the Status of the RTZ by sending the null command to monitor SO, bit RTZ1 (OD3)

- Bit PE12 is the null command

Table 7 (page 14),

Table 15 (page 19)

(b) Is RTZ1 (OD3) logic [0]? If not, Gauge 1 still returning and null command should be

resent.

VELR

(a) 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 Table 21, Velocity Table

Table 7 (page 15),

Table 21 (page 24)

POS0R

(a) Position Gauge 0 pointer

- Bits P011:P00: Desired Pointer Position

Table 9 (page 16),

Table 21 (page 24)

(b) Check SO for Out-of-Range VPWR

Bit OVUV (OD6) logic [1]? If so, use UV (OD8) and OV (OD9) to decide whether to

RTZ after valid VPWR

Bit OT0 logic [1]? If so, enable driver again. If OT0 continues to indicate

overtemperature, shut down Gauge 0

If RTZ0 returns to normal, re-establish the zero reference by RTZ command

POS1R

(a) Position Gauge 1 pointer

- Bits P1 11:P1 0: Desired Pointer Position

Table 10 (page 16),

Table 21 (page 24)

(b) Check SO for Out-of-Range VPWR

Bit OVUV logic [1]? If so, use UV (OD8) and OV (OD9) to decided whether to RTZ

after valid VPWR

- Bit OT1 logic [1]? If so, enable driver again. If OT1 continues to indicate overtemperature,

shut down Gauge 1.

- If OT1 returns to normal, re-establish the zero reference by RTZ command

POS0R

(a) Return the pointers close to zero position using POS0R

Table 9 (page 16)

(b) Move pointer position at least 12 microsteps CW to the nearest full step prior to RTZ

POS1R

Table 10 (page 16)

(d) Move pointer position at least 12 microsteps CW to the nearest full step position prior to

RTZ

(e) Check SO to see if Gauge 0 has moved

- Bit MOV0 logic [1]? If so, Gauge 0 moved to the first microstep

Table 10 (page 16),

Table 15 (page 19)

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

Step

Command

Description

Reference Table

and or Figure

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