AK9752AE Datasheet, PDF (11/36 Pages) Asahi Kasei Microsystems – Ultra-small IR sensor IC with IC

[AK9752]
10.4. Descriptions for each Operating Mode
10.4.1. Stand-by Mode (MODE [1:0] = “00”)
AK9752 goes to Stand-by Mode by resetting(POR or Software RST) or setting the operating mode
setting register. All circuits are powered down except for POR circuit. All registers can be accessed in
this mode.
Parameters and measurement data in registers are retained, and INTN is set to the initial state in this
mode.
10.4.2. Continuous Mode (MODE [1:0] = “01”)
When Continuous Mode (MODE [1:0] = “01”) is selected, the measurement is automatically repeated at
the period of 100ms(typ.). The read-out registers will be updated every after completion of a
measurement.
This mode is terminated by setting Stand-by Mode (MODE [1:0] = “00”).
When MODE [1:0] is changed during a measurement, the measurement is interrupted. Then the last
data is retained in the registers.
It is possible to write the threshold setting register and the interrupt setting register during this mode.
Change the register
Change the register
MODE[1:0]
00
01
00
Analog circuit
Power down
1.67ms (typ.)
Digital calculation
Wait
Measurement
Power on
Measurement Measurement
Measurement ^Measurement
Power down
Wait
Ready
100 ms (typ.)
Figure 10.2. Continuous Mode
When changing the mode,
measurement is interrupted.
Last data is retained in the registers.
10.4.3. Single Shot Mode (MODE [1:0] = “10”)
When AK9752 is set to Single shot Mode (MODE[1:0] = “10”), measurement is done one time, and the
measurement data is stored to the read-out registers. AK9752 becomes automatically powered down
except for POR circuit after completion of the measurement. MODE[1:0] changes to “00”.
The digital filter of ADC is invalid in this mode.
MODE[1:0]
00
Change the register
10
Analog Circuit
Power down
Power on
1.67ms (typ.)
Digital calculation
Wait
Measurement
Change the register
00
10
Power down
Wait
Power on
1.67ms (typ.)
Measurement
Ready
100 ms (typ.)
Ready
100 ms (typ.)
Figure 10.3. Single shot Mode
00
Power down
Wait
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