MCZ33991EG Freescale, MCZ33991EG Datasheet - Page 28

• 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

28
Table 18. 33991 Setup, Configuration, & Usage Example
33991
TIMING DESCRIPTIONS AND DIAGRAMS
APPLICATION INFORMATION
Step #
1
2
3
4
5
6
7
8
9
Command
RTZCR
POS0R
POS1R
PECR
PECR
PECR
PECR
RTZ
RTZ
a.
- Bit PE0: Gauge 0.
- Bit PE1: Gauge 1.
b.
- Bit PE3: Enables Calibration Procedure.
- Bit PE4: Set clock f =1 MHz maximum or nominal.
Send 8 µs pulse on CS to calibrate 1 MHz clock.
Set RTZ Full Step Time.
- Bits RC3:RC0.
Set RTZ Blanking Time.
- Bit RC4.
Preload RTZ Accumulator.
- Bits RC12:RC5.
Check SO for an Out-of-Range Clock Calibration
- Is bit ST7 logic 1? If so, then repeat Steps 1 and 2.
a.
Move pointer to position 24 prior to RTZ.
Check SO to see if gauge 0 has moved.
- Is 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 24 steps are finished, and both gauges are at a static
position, then RTZ. Otherwise repeat steps a) and b).
a.
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 that will clock out on the
SO pin.
b.
out on 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 and null command should be resent.
Return the other gauge to the zero stop. If the second gauge is driving a different
pointer than the first, then a new RTZCR command may be required to change the
Full Step time.
a.
command to monitor SO bit ST3
- Bit PE12 is the null command.
Is ST3 logic 0? If not then gauge 1 still returning and null command should be resent.
Enable Gauges.
Clock Calibration.
Move pointer to position 24 prior to RTZ
Return one gauge at a time to the zero stop using
Select the RTZ accumulator bits that will clock
Check the Status of the RTZ by sending the null
Check the Status of the RTZ by sending the null
Description
Analog Integrated Circuit Device Data
Freescale Semiconductor
Tables 9-10
Tables 9-10
Reference
Tables 7-8
Figure #
Table 11
Table 12
Table 12
Table 12
Table 12
Table 12
Figure 7
Table 3
Table 5
Table 6
Table 3
Table 7
Table 8
Table 3
Table 3