AK8996 Datasheet, PDF (63/74 Pages) Asahi Kasei Microsystems – Pressure Sensor Interface IC

[AK8996/W]
5.1.2) Reference Voltage Generator Register
j) VREF voltage adjustment (Register name: VREF)
Register for adjusting the AK8996 reference voltage. Perform an adjustment to attain the reference
voltage of 1000 mV (See Recommended Connection Example for Components).
∆VREF3/5 in the table below indicates a value varying with the setup values of the register. ∆VS3/5
represents the values of ∆VREF3/5 multiplied by two and four, respectively. The ratio is
benchmarked to 1000mV (VREF ideal value) as 100% (Ratio = ∆VREF/1000[mV]*100[%]).
Address: 12 hex D[2:0]=EVR[2:0]
EVR[2:0]
Ratio VDD: 3V, 3.3V mode
Dec Hex Bin
(%)
∆VREF3
(mV)
∆VS3
(mV)
-4 4 100 96
-40
-80
-3 5 101 97
-30
-60
-2 6 110 98
-20
-40
-1 7 111 99
-10
-20
0 0 000 100
0
0
1 1 001 101
+10
+20
2 2 010 102
+20
+40
3 3 011 103
+30
+60
VDD: 5V
∆VREF5 ∆VS5
(mV)
(mV)
-40
-160
-30
-120
-20
-80
-10
-40
0
0
+10
+40
+20
+80
+30
+120
Comments
Default
k) IREF current adjustment (Register name: IREF)
Register for adjusting the AK8996 reference current. Perform an adjustment to attain the reference
voltage of 20.0µA (See Recommended Connection Example for Components).
∆IREF in the table below indicates a value varying with the setup values of the register.
∆VIREF (= ∆IREF*47[kΩ]) is a voltage value varying with the external resistance (47kΩ) at the time of
adjustment.
The ratio is benchmarked to 20.0µA (IREF ideal value) as 100% (Ratio = ∆IREF/20[µA]*100[%]).
Address: 13 hex D[3:0]=EIR[3:0]
EIR[3:0]
Ratio
Dec Hex Bin
(%)
-8 8 1000
83.0
-7 9 1001
84.7
-6 A 1010
86.6
-5 B 1011
88.5
-4 C 1100
90.5
-3 D 1101
92.7
-2 E 1110
95.0
-1 F 1111
97.4
0 0 0000
100
1 1 0001
102.8
2 2 0010
105.7
3 3 0011
108.8
4 4 0100
112.2
5 5 0101
115.9
6 6 0110
119.8
7 7 0111
124.1
∆IREF
(µA)
-3.40
-3.05
-2.68
-2.30
-1.89
-1.46
-1.00
-0.52
0
+0.55
+1.14
+1.77
+2.45
+3.17
+3.96
+4.81
∆VIREF
(V)
-0.220
-0.203
-0.186
-0.168
-0.149
-0.129
-0.107
-0.084
-0.060
-0.034
-0.006
+0.023
+0.055
+0.089
+0.126
+0.166
Comments
Default
MS1055-E-02
63
2011/12