Vicom Systems FC-FC3 Bedienungsanleitung PDF herunterladen (Seite 60)

CONFIDENTIAL [AK8999A/AW/AD]

MS1600-E-00 2014/05

- 60 -

k) VREF voltage adjustment (EEPROM name: VREF)

This EEPROM is used for adjusting the AK8999A reference voltage. Perform an adjustment to attain the

reference voltage of 1000mV (See “Recommended External Circuits”).

ΔVREF3/5 in the table below indicates a value varying with the setup values of the EEPROM.

ΔVS3/5 represents the values of ΔVREF3/5 multiplied by two and four, respectively. The ratio in the

table below is benchmarked to 1000mV (VREF ideal value) as 100%

(Ratio = (ΔVREF3/5) /1000[mV]*100[%]).

Address : 0F hex D[2:0] = EVR[2:0]

EVR[2:0] Ratio VDD:3V, 3.3V mode VDD:5V

Description

Dec Hex Bin (%)

ΔVREF3

(mV)

ΔVS3

(mV)

ΔVREF5

(mV)

ΔVS5

(mV)

-4 4 100 -4 -40 -80 -40 -160

-3 5 101 -3 -30 -60 -30 -120

-2 6 110 -2 -20 -40 -20 -80

-1 7 111 -1 -10 -20 -10 -40

0 0 000 0 0 0 0 0 Default

1 1 001 1 +10 +20 +10 +40

2 2 010 2 +20 +40 +20 +80

3 3 011 3 +30 +60 +30 +120

l) IREF current adjustment (EEPROM name: IREF)

This EEPROM is used for adjusting the AK8999A reference current. The external resistor (1M) is

connected to VOUT pin. The reference current is adjusted so that the voltage droped by external

resistor may be set to 1.0V. (See “Recommended External Circuits”).

IREF in the table below indicates a current value with the setup values of the EEPROM.

VIREF (=IREF*1[MΩ]) is a voltage value varying with the external resistance (1MΩ) at the time of

adjustment. The ratio is benchmarked to 1.0µA (IREF ideal value) as 100%

(Ratio = (IREF-1.0 [µA])/1.0 [µA]*100[%]).

Address : 0F hex D[7:4] = EIR[3:0]

EIR[3:0] Ratio IREF VIREF

Description

Dec Hex Bin (%) (μA) (V)

-8 8 1000 -17.0 0.830 0.830

-7 9 1001 -15.2 0.848 0.848

-6 A 1010 -13.4 0.866 0.866

-5 B 1011 -11.5 0.885 0.885

-4 C 1100 -9.5 0.905 0.905

-3 D 1101 -7.3 0.927 0.927

-2 E 1110 -5.0 0.950 0.950

-1 F 1111 -2.6 0.974 0.974

0 0 0000 0.0 1.000 1.000 Default

1 1 0001 2.8 1.028 1.028

2 2 0010 5.7 1.057 1.057

3 3 0011 8.8 1.088 1.088

4 4 0100 12.2 1.122 1.122

5 5 0101 15.9 1.159 1.159

6 6 0110 19.8 1.198 1.198

7 7 0111 24.1 1.241 1.241

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 66 67 68

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