TCS3404, TCS3414
DIGITAL COLOR SENSORS
TAOS137A − APRIL 2011
Timing Register (01h)
The TIMING register controls the synchronization and integration time of the ADC channels. The Timing
Register settings apply to all four ADC channels. The Timing Register defaults to 00h at power on.
Table 5. Timing Register
7
6
5
4
3
0
2
1
0
0
0
TIMING
01h
Resv SYNC_EDGE
INTEG_MODE
PARAM
Reset Value:
0
0
0
0
0
FIELD
BITS
DESCRIPTION
Resv
7
Reserved. Write as 0.
Sync pin edge. If SYNC_EDGE is low, the falling edge of the sync pin is used to stop an integration
cycle when INTEG_MODE is 11. If SYNC_EDGE is high, the rising edge of the sync pin is used to
stop an integration cycle when INTEG_MODE is 11.
SYNC_EDGE
6
Selects preset integration time, manual integration (via serial bus), or external synchronization (SYNC
IN) modes.
FIELD VALUE
MODE
In this mode, the integrator is free-running and one of the three
internally-generated Nominal Integration Times is selected for each conversion
(see Integration Time table below).
00
Manually start/stop integration through serial bus using ADC_EN field in Con-
trol Register.
INTEG_MODE
5:4
01
10
Synchronize exactly one internally-timed integration cycle as specified in the
NOMINAL INTEGRATION TIME beginning 2.4 μs after being initiated by the
SYNC IN pin.
Integrate over specified number of pulses on SYNC IN pin (See SYNC IN
PULSE COUNT table below). Minimum width of sync pulse is 50 μs. SYNC
IN must be low at least 3.6 μs.
11
Uses single, multipurpose bitmapped field to select one of three predefined integration times or set the
number of SYNC IN pulses to count when the INTEG_MODE accumulate mode (11) is selected.
NOTE: INTEG_MODE and TIME/COUNTER fields should be written before ADC_EN is asserted.
FIELD VALUE
0000
NOMINAL INTEGRATION TIME
12 ms
0001
100 ms
400 ms
0010
FIELD VALUE
0000
SYNC IN PULSE COUNT
PARAM
3:0
1
0001
2
0010
4
0011
8
0100
16
32
64
128
256
0101
0110
0111
1000
Copyright E 2011, TAOS Inc.
The LUMENOLOGY r Company
r
r
16
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TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
