AK8999A Datasheet, PDF (65/68 Pages) Asahi Kasei Microsystems – Pressure Sensor Control IC

CONFIDENTIAL
[AK8999A/AW/AD]
b) OSC variable ratio storing register (Register name: CM2)
This register is used for adjustment of the oscillator frequency of AK8999A. The counted value in
the internal counter is stored. Since the internal counter is overflowing when a count value shows
FF hex, measure again by re-defining High level period.
This register is read only. In addition, the value of the register returns to the initial value on the
following conditions.
■ At the power up
■ When CM1 register is written
■ When CSCLK = Low is maintained 0.5msec or more
■ When ETST[0] is set to "L"
Address : 01 hex D[7:0] = CT[7:0]
(This is not a nonvolatile EEPROM, but a volatile register.)
CT[7:0]
Dec Hex
Bin
Count value
(time)
Ratio
(%)
Description
0 00 00000000
0
0
Default
1 01 00000001
1
-99
：：
：
：
：
98 62 01100010
98
-2
99 63 01100011
99
-1
100 64 01100100
100
0
Ideal value
101 65 01100101
101
1
102 66 01100110
102
2
：：
：
：
：
254 FE 11111110
254
154
255 FF 11111111
-
-
Counter error
MS1600-E-00
- 65 -
2014/05