AK8975 データシートの表示（PDF） - Asahi Kasei Microdevices

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AK8975

3-axis Electronic Compass

Asahi Kasei Microdevices 

[AK8975/C]

6. Functional Explanation

6.1. Power States

When VDD and VID are turned on from Vdd=OFF (0V) and Vid=OFF (0V), all registers in AK8975/C are

initialized by POR circuit and AK8975/C transits to Power-down mode.

All the states in the table below can be set, although the transition from state 2 to state 3 and the transition from

state 3 to state 2 are prohibited.

States VDD

1 OFF (0V)

2 OFF (0V)

3 2.4V to 3.6V

4 2.4V to 3.6V

VID

OFF (0V)

1.65V to 3.6V

OFF (0V)

1.65V to Vdd

Power states

OFF (0V).

SCL, SDA should be fixed to the voltage that does

not exceed 3.6V. Other digital pins should be fixed

to L(0V).

OFF (0V). It doesn’t affect external interface.

OFF (0V). It consumes current same as

Power-down mode.

SCL, SDA should be fixed to the voltage that does

not exceed 3.6V. Other digital pins should be fixed

to L (0V).

ON

Table 6.1

6.2. Reset Functions

AK8975/C has two types of reset;

(1) Power on reset (POR)

When Vdd reaches approximately 2V (reference value for design), POR circuit operates, and AK8975/C

is reset.

(2) VID monitor

When Vid is turned OFF (0V), AK8975/C is reset.

When AK8975/C is reset, all registers are initialized and AK8975/C transits to Power-down mode.

MS1187-E-02

- 11 -

2010/05

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