AK9752AE Datasheet, PDF (14/36 Pages) Asahi Kasei Microsystems – Ultra-small IR sensor IC with IC

[AK9752]
When a data read-out starts after Nth measurement, and when it is not completed until the end of
(N+1)th measurement, the read-out registers are protected to read out the data normally.
In this case, (N+1)th data can be read out by re-reading out before (N+2)th measurement completion.
Measurement
(N) th
Meas.
PD (Power down)
(N+1) th
Meas.
PD
(N+2) th
Meas.
PD
Internal Buffer (N-1)th data (N)th data
(N+1)th data
(N+2)th data
Read-out Register (N-1)th data (N)th data
DRDY(ST1)
DOR(ST2)
(N+1)th data
Read-out Register is protected during read-out.
DRDY retains "1" and Read-out Register
is updated at read-out completion.
INTN output
SDA output
ST1 INTC (N)th data
ST2
ST1 INTC (N+1)th data ST2
* INTC = INTCAUSE
Figure 10.7. Measurement Completion during read-out data (one measurement)
When (N+1)th and (N+2)th measurement are completed during (N)th data read-out, (N+1)th data is
skipped and DOR changes to “1” after (N+2)th measurement.
DOR returns to “0” when the next read-out.
Measurement
(N) th
Meas.
PD (Power down)
(N+1) th
Meas.
PD
(N+2) th
Meas.
PD
Internal Buffer (N-1)th data (N)th data
(N+1)th data
(N+2)th data
Read-out Register (N-1)th data (N)th data
DRDY(ST1)
DOR(ST2)
(N+2)th data
Read-out Register is protected during read-out.
DRDY retains "1". Read-out Register is updated at read-out completion.
(N+1)th data is skipped.
INTN output
SDA output
ST1 INTC (N)th data
ST2
* INTC = INTCAUSE
Figure 10.8. Measurement Completion during read-out data (twice measurement)
10.5.4. End Operation
Select Stand-by Mode (MODE[1:0] = “00”) to quit the Continuous Mode.
10.5.5. Example of Read-out Procedure
Example of read-out procedure of AK9752 is shown in the following.
The below settings are assumed.
・Continuous Mode
・Cut-off frequency of Digital Filter Fc=0.45Hz
・Data ready interrupt setting is enable.  INTN output turns to “L”(Active) after completion of data ready.
016016473-E-00
- 14 -
2017/1