TMG3992 Datasheet, PDF (66/95 Pages) ams AG – Gesture, Color, ALS, and Proximity Sensor Module with mobeam Barcode Emulation

Figure 69:
Configuration Register A5
7
6
5
TMG3992− RegisterDescription
Configuration Register A5 (CONFIG_A5),
IRBeam Mode
While IRBeam is enabled, this register defines the length of time
that the LDR pin is disabled (i.e. LED is turned OFF) between
consecutive Packet loops. The following equation governs the
time delay:
t_IPDT = 4 × (IPOFF + 1) × t_IBT
The minimum typical inter-Packet LED OFF time is 1.0 μs. The
maximum typical inter-Packet LED OFF time 17.7ms.
4
3
2
1
0
IPOFF
Field
IPOFF
Bits
7:0
Description
IRBeam Packet OFF Delay Time. Sets the amount of LED OFF time
between Packets.
Figure 70:
Configuration Register A6
7
6
5
Reserved
Configuration Register A6 (CONFIG_A6),
IRBeam Mode
While in IRBeam mode, this register selects the pulse width of
one bit-time. This is fundamental time period for pattern
generation.
The minimum typical bit-time 0.27μs (IBT = 0). The maximum
typical bit-time is 17.28μs (IBT = 0x3F).
4
3
2
1
0
IBT
Field
Reserved
IBT
Bits
7:6
5:0
Description
Reserved. Bits must be set to 0 in IRBeam mode.
IRBeam Bit Time. Defines the pulse width for one bit-time.
The IRBeam bit time is set by the following equation:
t_IBT = (IBT + 1) × 0.27μs
Page 66
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ams Datasheet
[v1-04] 2014-Oct-24