AK8999AD Datasheet, PDF (47/68 Pages) Asahi Kasei Microsystems – Pressure Sensor Control IC

CONFIDENTIAL
[AK8999A/AW/AD]
5.2) Control Register (Volatile Memory) Map
Name
CM1
CM2
Note)
Note1)
Content
Adjustment mode
Address
Data
(hex)
D7
D6
D5
D4
D3
AM[3]
00h
0
OSC variable ratio
Note1)
CT[7]
CT[6]
CT[5]
CT[4]
CT[3]
01h
0
0
0
0
0
Reserved
02h –
1Fh
Lower line of each data represents the control register data upon power-up.
Access to the reserved addresses is prohibited.
Write “0” to the unused D[7:0].
Access to this register serves as ReadOnly.
D2
AM[2]
0
CT[2]
0
D1
AM[1]
0
CT[1]
0
D0
AM[0]
0
CT[0]
0
6) EEPROM and control register Description
6.1) Description of EEPROM
Offset and span adjustment should be made after measurement mode setup and adjustment of the
reference generator including VREF, IREF, OSC and VTMP.
a) Offset voltage adjustment (EEPROM names: OCR, OCF)
Coarse adjustment should be performed first, followed by a fine adjustment for the offset voltage.
The content of the adjustment EEPROMs are shown here.
a.1) Offset voltage coarse adjustment (OCR)
The offset voltage is adjusted coarsely.
The offset adjustment voltage varies ratiometrically with respect to the supply voltage.
The ratio in the table below is benchmarked to a VOUT output of 4800 mV (@VDD: 5V) as 100%
(Ratio = (Offset voltage @VDD: 5V)/4800[mV]*100[%]).
Address : 00 hex D[3:0] = EOCR[3:0]
EOCR [2:0]
Ratio VDD:3V, 3.3V
EOCR EOCR
Dec Hex
Bin
(%) [3] = 0 [3] = 1
(mV)
(mV)
00
000
0.00
0
0
11
001
33.33
800
-800
22
010
66.67 1600
-1600
33
011
100.00 2400
-2400
44
100
133.33 3200
-3200
55
101
166.67 4000
-4000
66
110
200.00 4800
-4800
77
111
233.33 5600
-5600
VDD:5V
EOCR EOCR
[3] = 0
(mV)
[3] = 1
(mV)
0
0
1600
-1600
3200
-3200
4800
-4800
6400
-6400
8000
-8000
9600
-9600
11200 -11200
Description
Default
MS1600-E-00
- 47 -
2014/05