AK9753 Datasheet, PDF (13/50 Pages) Asahi Kasei Microsystems – IR Sensor IC with I2C I/F

[AK9753]
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 AK9753 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
INT pin Analog Circuit
OFF(0V)
“L”
Disable Unfixed Power Down
1.65 ~ 3.63V “H” or “L” Disable Unfixed Power Down
OFF(0V)
“L”
Disable Unfixed Power Down
OFF(0V)
“H”
Disable Unfixed Power Down
1.65V ~ VDD
“L”
Disable
“H”
Power Down
1.65V ~ VDD
“H”
Enable
“H”
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.
AK9753 has five reset functions.
(1) Power-on Reset(POR)
Power-on Reset circuit resets AK9753 by detecting VDD and DVDD rising.
When VDD and DVDD turns ON with PDN pin= “L”, POR does not operate, because POR circuit is
also in PD state.
(2) Hardware Reset
AK9753 is reset by PDN pin= “L”
(3) Software Reset
AK9753 is reset by setting SRST bit.
(4) DVDD Monitor Reset
When DVDD turns OFF (DVDD ≤ 0.2V), AK9753 is reset.
(5) Power Supply Reset
AK9753 is reset by VDD= 0V.
When AK9753 is reset, all registers are set to initial values.
017005237-E-00
- 13 -
2017/04