AK9750 Datasheet, PDF (17/49 Pages) Asahi Kasei Microsystems – IR Sensor IC with I2C I/F

[AK9750]
11.4 Descriptions for each Operating Mode
11.4.1. Power down Mode (PDN pin= “L”)
All circuits are powered off with PDN pin= “L”. The all functions of AK9750 do not work in this Mode.
11.4.2. Stand-by Mode (EMODE [2:0] = “000”)
All circuits are powered off except for POR circuit. All registers can be accessed in this Mode.
Read / Write register data are retained, and reset by software reset.
However, EEPROM data cannot be read / written in this Mode. Reading/Writing EEPROM data must be
done in EEPROM access Mode.
The data registers (ST1 to ST2) should not be accessed in Stand-by Mode. It causes the malfunction of
AK9750.
11.4.3. EEPROM Access Mode (EMODE [2:0] = “001” and EEPMODE= “1”)
When EMODE [2:0] bits are changed from Stand-by Mode (EMODE [2:0] = “000”) to EMODE [2:0] =
“100” and EEPROM bit is set as “1”, EEPROM Access Mode is selected. Reading / Writing EEPROM
data should be done in EEPROM Access Mode. When EKEY [7:0] bit is set as “A5H” in EEPROM
Access Mode, the data can be written to EEPROM.
Data measurement is not done in EEPROM Access Mode.
11.4.4. Single Shot Mode (EMODE [2:0] = “010”)
When AK9750 is set to Single shot Mode (EMODE [2:0] = “010”), measurement is done once, and the
Measurement data is stored to the measurement data registers (IR1L to TMPH). Then the analog circuits
except for POR circuit are automatically powered off. When the registers from ST1 to ST2 are read, the
AK9750 automatically shifts to Stand-by Mode (EMODE [2:0] = “000”).
Change the register
EMODE[2:0]
000
001
Read the data Change the register
010 000
010
010
000
Analog Circuit
Power down
Digital calculation
Wait
Power on
4.5ms
Power down
Measurement
Wait
Power on
4.5ms
Measurement
Power down
Wait
Ready
(Depended on EFC[2:0])
Ready
Figure 11.3. Single shot Mode
015002896-E-01
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2015/10