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TMD27253M Datasheet(PDF) 19 Page - ams AG

Part # TMD27253M
Description  The device features advanced proximity measurement
PDF  50 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

TMD27253M Datasheet(HTML) 19 Page - ams AG

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ams Datasheet
Page 19
[v1-11] 2016-Sep-20
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TMD2725 − Register Description
ATIME Register (Address 0x81)
Figure 22:
ATIME Register
The ATIME register controls the integration time of the ALS
ADCs. The timer is implemented with a down counter with 0x00
as the terminal count. The timer is clocked at a 2.8ms nominal
rate. Loading 0x00 will generate a 2.8ms integration time,
loading 0x01 will generate a 5.6ms integration time, and so
forth. The RC oscillator runs at 8MHz nominal rate. This gets
divided by 11 to generate the integration clock of 727kHz. One
count in ATIME (nominal 2.8ms) are 2.81ms. This is 2048
integration clock cycles: 125ns*11*8*256=2.81ms.
PTIME Register (Address 0x82)
Figure 23:
PTIME Register
Addr: 0x81
ATIME
Bit
Bit Name
Default
Access
Bit Description
7:0
ATIME
0x00
RW
ALS value that specifies the integration time in 2.81ms
intervals. 0x00 indicates 2.8ms. The maximum ALS value
depends on the integration time. For every 2.81ms, the
maximum value increases by 1024. This means that to
be able to reach ALS full scale, the integration time has
to be at least 64*2.8ms.
Value
Integration
Cycles
Integration
Time
Maximum
ALS Value
0x00
1
2.8ms
1023
0x01
2
5.6ms
2047
……
…
…
0x3F
64
180ms
65535
……
…
…
0xFF
256
719ms
65535
Addr: 0x82
PTIME
Bit
Bit Name
Default
Access
Bit Description
7:0
PTIME
0x1F
RW
This register defines the duration of 1 Prox Sample,
which is (PTIME + 1)*88μs.



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