AK09918 Datasheet, PDF (8/30 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

[AK09918]
9. Function Descriptions
9.1. Power States
When VDD is turned on from Vdd = OFF (0V), all registers in AK09918 are initialized by POR circuit and
AK09918 transits to Power-down mode.
State
1
2
VDD
OFF (0V)
1.65V to 1.95V
Table 9.1. Power state
Power state
OFF
It doesn’t affect external interface.
ON
9.2. Reset Functions
Power on Reset (POR) works until Vdd reaches to the operation effective voltage (about 1.1V: reference
value for design) on power-on sequence. After POR is completed, all registers are initialized and AK09918
transits to Power-down mode.
When Vdd = 1.65 to 1.95V, POR circuit is active.
AK09918 has two types of reset;
(1) Power on Reset (POR)
When Vdd rise is detected, POR circuit operates, and AK09918 is reset.
(2) Soft reset
AK09918 is reset by setting SRST bit. When AK09918 is reset, all registers are initialized and
AK09918 transits to Power-down mode.
016014242-E-00
-8-
2016/11