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AK9750 Datasheet, PDF (13/49 Pages) Asahi Kasei Microsystems – IR Sensor IC with I2C I/F | |||
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[AK9750]
11. Functional Descriptions
11.1 Power Supply States
When VDD, DVDD and PDN turn on from the state of VDD= DVDD= OFF(0V), Power-on Reset(POR)
automatically operates, all registers will be initialized, and the AK9750 will be set to Stand-by Mode.
Although all states of the Following table can exist, the state 2 is prohibited.
State
1
2
3
4
5
VDD pin
OFF(0V)
OFF(0V)
1.71 ~ 3.63V
1.71 ~ 3.63V
1.71 ~ 3.63V
6 1.71 ~ 3.63V
Table 11.1. Power Supply States and Functions
DVDD pin PDN pin
I2C
INI pin Analog Circuit
OFF(0V)
âLâ
Disable Unfixed Power Down
1.65 ~ 3.63V âHâ or âLâ Disable Unfixed Power Down
OFF(0V)
âLâ
Disable Unfixed Power Down
OFF(0V)
âHâ
Disable Unfixed Power Down
1.65V ~ VDD
âLâ
Disable
âHâ
Power Down
1.65V ~ VDD
âHâ
Enable
âHâ
POR circuit
only operates
IDD
Unknown
Unknown
Unknown
Unknown
< 1µA
< 10µA
11.2 Reset functions
When VDD turns ON, set up DVDD lower than VDD(DVDD ⤠VDD).
Power-on Reset (POR) operates unit VDD reaches the operating voltage (1.4V Typ.). After POR, all
registers are set to initial values, and Stand-by Mode is selected.
AK9750 has five reset functions.
(1) Power-on Reset(POR)
Power-on Reset circuit resets AK9750 by detecting VDD and DVDD rising.
When VDD and DVDD turns ON with PDN pin= âLâ, POR does not operate, because POR circuit is
also in PD state.
(2) Hardware Reset
AK9750 is reset by PDN pin= âLâ
(3) Software Reset
AK9750 is reset by setting SRST bit.
(4) DVDD Monitor Reset
When DVDD turns OFF (DVDD ⤠0.2V), AK9750 is reset.
(5) Power Supply Reset
AK9750 is reset by VDD= 0V.
When AK9750 is reset, all registers are set to initial values.
015002896-E-01
- 13 -
2015/10
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