Vicom Systems FC-FC3 Manual de usuario descargar pdf (Pagina 31)

CONFIDENTIAL [AK8999A/AW/AD]

MS1600-E-00 2014/05

- 31 -

Address : 10 hex D[3:0] = EFR[3:0]

EFR[3:0] Ratio Frequency Δf

Description

Dec Hex Bin (%) (kHz)

-5 B 1011 -34 -251

-4 C 1100 -25 -197

-3 D 1101 -17 -146

-2 E 1110 -11 -99

-1 F 1111 -5 -52

0 0 0000 0 0 Default

1 1 0001 5 49

2 2 0010 10 106

3 3 0011 14 162

4 4 0100 18 224

5 5 0101 22 274

6 6 0110 25 329

7 7 0111 28 384

Note1) Hex 8 to A are prohibited for setup.

When High level period is not 2msec, the ideal value of CT [7:0] can be calculated as follows.

Considering the calculated ideal value as 100%, and a ratio should be redefined. Please set the

adjustment data of oscillation frequency as the sum of the ratio of CT [7:0] data and the ratio of

EFR [3:0] data is close to 0%.

Count value[time] = High time[msec] / 2 * 100

ex.) In the case of 3 msec, 100time → 150time.

1.4) VTMP Adjustment (completed when shipped in package form)

Temperature sensor output (VTMP) voltage is adjusted to match the VREF voltage.

When the external temperature sensor is used, connect the external temperature sensor to the EXTMP

pin, and set up a measurement mode 1 EEPROM (address: 0Dh, data: ETMP[1:0] = 0 or 1h).

VTMP voltage is observed at VOUT pin while the CSCLK pin High (CSCLK High Time) after the

writing of an adjustment mode register (C address: 00h, data: AM[3:0] = 4h).

*At the VTMP adjustment using the external temperature sensor, the External Temperature Sensor

Drive circuit is normal ON in the sampling frequency 8.33kHz mode (ESF[0] = 0h).

If the actual operationg condition is the sampling frequency 0.83kHz mode (ESF[0] = 1h), AK8999A

operates intermittent. The external temoperature sensor output voltage may be different from the voltage

after the VTMP adjustment.

VOUT

CSCLK

1 4 169

Twr_REG

Hi-z

VTMP

monitor

CSCLK High Time

Analog

Output

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 67 68

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Vicom Systems FC-FC3 Manual de usuario Pagina 31

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