MCZ33991EG Freescale, MCZ33991EG Datasheet - Page 29

• Manufacturer Part Number: MCZ33991EG
• Manufacturer: Freescale

Specifications of MCZ33991EG

• Operating Current: 6mA
• Operating Temperature Classification: Automotive
• Package Type: SOIC W
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Compliant

Table 18. 33991 Setup, Configuration, & Usage Example (continued)
Analog Integrated Circuit Device Data
Freescale Semiconductor
Step #
10
11
12
13
14
15
16
17
Command
POS0R
POS1R
POS0R
POS1R
PECR
PECR
VELR
RTZ
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.
Position Gauge 0 pointer
- Bits P0 11: P0 0: Desired Pointer Position
Check SO for Out of Range V
- Bit ST6 logic 1? If so, then RTZ after valid V
Check SO for over temperature bit ST0 logic 1? If so, then enable driver again. If ST0
continues to indicate over temperature, shut down Gauge 0.
If ST2 returns to normal, then reestablish the zero reference by RTZ command.
Position Gauge 1 pointer
- Bits P1 11:P1 0: Desired Pointer Position.
Check SO for Out-of-Range V
Check SO for Over temperature bit ST1 logic 1? If so, then enable driver again. If
ST1 continues to indicate over temperature, then shut down Gauge 1. If ST1 returns
to normal, re-establish the zero reference by RTZ command.
a.
POS0R.
b.
to the nearest full step prior to RTZ.
Return the pointers close to zero position using POS1R.
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.
- Bit ST4 logic 1? If so then the gauge 0 has moved to the first microstep.
Send null command to see if gauges have moved.
- Bits PE12
Check SO to see if Gauge 0 (Gauge 1) has moved
- Bit ST4 (ST5) logic1? If so, then Gauge 0 (Gauge 1) has moved another microstep.
Keep track of movement and if 12 steps are finished, and both gauges are at a static
position, then RTZ. Otherwise repeat steps a) and b).
a.
using
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 that will clock out on
the SO pin.
b.
the SO bits ST15:ST8. These will be used if characterizing the RTZ.
- Bits RZ3:RZ2 are used to select the bits.
a.
command to monitor SO bit ST2
- Bit PE12 is the null command.
Is ST2 logic 0? If not then gauge 0 still returning. Null command should be resent.
RTZ command
PWR
PWR
Return the pointers close to zero position using
Move pointer position at least 24 microsteps CW
Return one Gauge at a time to the zero stop
Select the RTZ accumulator bits clocking out on
Check the Status of the RTZ by sending the null
Description
bit ST6 logic 1? If so, then RTZ after valid V
PWR
TIMING DESCRIPTIONS AND DIAGRAMS
APPLICATION INFORMATION
PWR
.
Reference
Tables 7-8
Figure #
Table 12
Table 12
Table 12
Table 12
Table 12
Table 4
Table 5
Table 6
Table 5
Table 6
Table 3
Table 3
33991
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