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SI1120 Datasheet(PDF) 7 Page - Silicon Laboratories

No. de pieza SI1120
Descripción Electrónicos  PROXIMITY/AMBIENT LIGHT SENSOR WITH PWM OUTPUT
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Fabricante Electrónico  SILABS [Silicon Laboratories]
Página de inicio  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI1120 Datasheet(HTML) 7 Page - Silicon Laboratories

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Si1120
Rev. 1.0
7
2.2. Mode Selection
The Si1120 features a shutdown mode, three proximity-detection modes, three ambient-light sensing modes, and
an offset calibration for high-sensitivity mode. Mode selection is accomplished through the sequencing of the SC
(shutdown/clock), MD (mode), and STX (strobe/transmit) pins.
The part enters shutdown mode unconditionally when SC is high. Each of the MD and STX inputs should be set to
a valid high or low state. In shutdown mode, the PRX output is tri-stated, and the power-supply and TXO output
leakage currents are negligible.
The active modes are set by clocking the state of MD and STX on the falling edge of SC and then setting MD to the
required state. Since setting SC high forces shutdown, SC must be held low for the selected mode to remain
active. The timing diagram in Figure 2 illustrates the programming sequence. Table 4 indicates the various mode
encodings. After the correct state has been programmed, the STX input is used to trigger measurements.
Figure 2. Si1120 Mode Programming Timing Diagram
If the mode must be changed, the SC pin may need to be rearmed (set high), in which case the shutdown mode is
set and a power-on latency of about 500 µs is incurred upon enabling of the selected mode when SC goes back
low. Following a mode change, STX must be kept low during the power-up latency period. If the host sets STX too
early, the Si1120 may not begin a measurement cycle; PRX does not assert. If this occurs, the host can restart a
measurement by toggling STX.
Table 4. Mode Control Table
Mode
Description
STX (Latch) MD (Latch)
MD (Static)
PRX400
Proximity, 400 mA LED current (Mode 0)
0
0
0
OFC
Offset calibration for high sensitivity (Mode 1)
0
0
1
PRX50
Proximity, 50 mA LED current (Mode 2)
0
1
0
PRX50H
Proximity, 50 mA LED current, high reflectance (Mode 3)
0
1
1
VIRL
Visible and infrared ambient, low range (Mode 4)
1
0
0
VAMB
Visible ambient (Mode 5)
1
0
1
VIRH
Visible and infrared ambient, high range (Mode 6)
1
1
0
(Reserved) Reserved mode
1
1
1


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