mc33970 Freescale Semiconductor, Inc, mc33970 Datasheet - Page 31

• Manufacturer Part Number: mc33970
• Description: Dual Gauge Driver Integrated Circuit With Improved Damping Algorithms
• Manufacturer: Freescale Semiconductor, Inc

variety of applications.
example of configuring and using many of the features
designed into the IC.
Table 22. 33970 Setup, Configuration, and Usage Example
Analog Integrated Circuit Device Data
Freescale Semiconductor
Step
The 33970 is an extremely versatile device used in a
1
2
3
4
5
6
Command
PECCR
RTZCR
POS0R
POS1R
PECCR
RTZ
Table 22
(a) Enable Gauges
(b) Clock Calibration
(c) Send 8.0 µs pulse on CS to calibrate 1.0 MHz clock
(a) Set RTZ Full Step Time
(b) Set RTZ Blanking Time
(c) Preload RTZ Accumulator
(d) Check SO for an Out-of-Range Clock Calibration
(a) Move pointer to position 12 prior to RTZ
(a) Move pointer to position 12 prior to RTZ
(b) Check SO to see if Gauge 0 has moved
(a) Send null command to see if gauges have moved
(b) Check SO to see if Gauge 0 (Gauge 1) has moved
(a) Return one gauge at a time to the zero stop using RTZ command
(b) Select the RTZ accumulator bits to clock out on the SO bits using bits PE11:PE10. These
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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)
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pointer is static
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will be used if characterizing the RTZ.
Bit PE0: Gauge 0
Bit PE1: Gauge 1
Bit PE3: Enables Calibration Procedure
Bit PE4: Set clock f = 1.0 MHz maximum or nominal
Bits RC3:RC0
Bit RC4
Bits RC12:RC11 and RC10:RC5
Is bit CAL logic [1]? If so, then repeat Steps 1 and 2
Is bit MOV0 (OD4) logic [1]? If so then the Gauge 0 has moved to the first microstep
Bit PE12
Is bit MOV0 (OD4) (MOV1 (OD5)) logic [1]? If so, then Gauge 0 (Gauge 1) moved
Bit CMD0 (OD10) (CMD1 (OD11)) could also be monitored to determine that the
Bit RZ0 selects the gauge
Bit RZ1 is used to enable or disable an RTZ
Bits RZ2 is used to select the direction (along with PE7)
provides a step-by-step
TYPICAL APPLICATIONS
INTRODUCTION
Description
the device could be used. Further, it is intended to familiarize
users with some of its capabilities.
This example is intended to give a generic overview how
TYPICAL APPLICATIONS
Figure 10
Table 12
Table 13
Table 14
Table 15
Table 10
Table 15
Table 15
Table 11
Table 16
Table 7
Table 7
Table 7
Table 7
Table 7
Table 9
Table 7
Reference Table
INTRODUCTION
and or Figure
(page 14),
(page 14),
(page 14),
(page 14),
(page 14),
(page 16)
(page 14)
(page 17),
(page 18)
(page 18)
(page 19)
(page 16)
(page 19)
(page 19)
(page 16)
(page 20)
(page 27)
33970
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