Vicom Systems FC-FC3 Bedienungsanleitung PDF herunterladen (Seite 9)

CONFIDENTIAL [AK8999A/AW/AD]

MS1600-E-00 2014/05

- 9 -

Reference Section & Others

Block

Functions

V_Bandgap

(VBG)

V_Reference

(VREF)

I_Reference

(IREF)

Generates the reference voltage or bias current required for each circuit.

The VREF voltage is adjusted to 1.0V.

VREF voltage adj. Resolution 3bits

Adj. step 1% / step

IREF current is adjusted to 1.0V, in state of connecting 1MΩ external resistor to VOUT

pin.

IREF current adj. Resolution 4bits

Adj. step 2.8% / step

Oscillator

(OSC)

Oscillator to generate timing sync signals for internal operation and sampling

frequencies. Oscillation frequency is adjusted as the counter result reaches the expected

value, the internal counter counts for the period of CSCLK is high (2msec typ.). For the

detail, refer to the Functional Descriptions 1) Adjustment Procedure Description (Example).

OSC adj. Resolution 4bits

Adj. step 5% / step

V_temp.

(VTMP)

Temperature sensor converting the ambient temperature to voltage. Adjust the

temperature sensor output voltage so that it is equal to VREF voltage at 25ºC.And it is

also possible to select the external temperature sensor by EEPROM in the case where a

pressure sensor and the AK8999A are separated physically. When the external

temperature sensor is chosen, it is driven by 50uA constant current which is sunk or

sourced from the EXTMP pin.

VTMP voltage adj.(internal) Resolution 6bits

Adj. step 0.2% / step

VTMP voltage adj.(external) Resolution 9bits (Coarse /Fine=3/6bits)

Adj. step Coarse 10% /step / Fine 0.2% /step

V_Common

(VCOM)

Generates analog circuit reference voltage 0.5*VDD.

The internal power-up circuit causes it to start up within the settling time for stable

analog operation.

Power ON

Reset(POR)

Power Up circuit is for stable analog operation upon power-up.

In order to make the power-on reset effective, be sure to power up the supply voltage

from below 0.1*VDD.

Serial I/F

Serial interface for accessing EEPROM and control register (volatile memory).

It accesses using the CSCLK pin and the VOUT pin.

EEPROM &

Control

EEPROM and control register (volatile memory).

Used to store compensation values and measurement modes and to set up the

measurement modes for adjustment.

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