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ISL29120 Datasheet(PDF) 5 Page - Renesas Technology Corp

Part # ISL29120
Description  Digital Output, Low Power, Red, Green, and Blue Color Light Sensor
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL29120 Datasheet(HTML) 5 Page - Renesas Technology Corp

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ISL29120
FN8314 Rev 0.00
Page 5 of 8
May 29, 2012
Register Set
There are eight registers that are available in the ISL29120. Table 1 summarizes their functions.
Command Register I 0x00
The first command register has the following functions:
Operation Mode: Bits[7:5]. These three bits determine the
operation mode of the device.
Interrupt flag: Bit[2]. This is the interrupt status bit. The bit is set
high when the interrupt thresholds have been triggered. Once
triggered, the INT pin stays low and the status bit stays high. Both
the interrupt pin and the status bit are cleared at the end of
Command Register I read.
Interrupt persist: Bits[1:0]. The interrupt pin and the interrupt flag
are triggered/set when the data sensor reading is out of the
interrupt threshold window after m consecutive data conversion
cycles. The interrupt persist bits determine m.
Command Register II 0x01
The second command register has the following functions:
Resolution: Bits[3:2] determine the ADC’s resolution and the
integration time. The integration time is the period the device’s
analog-to-digital (A/D) converter samples the photodiode current
for a measurement.
1. Range 0x01[0]: The Full Scale Optical Range (FSOR). Optical
sensitivity for the ‘Low’ range is 4.75 times the optical
sensitivity in ‘High’ range.
TABLE 1. REGISTER SET
ADDR
REG NAME
BIT
76
5
4
3
2
1
0
DEFAULT
00h
COMMANDI
OP2
OP1
OP0
0
0
IFLG
PRST1
PRST0
00h
01h
COMMANDII
0
0
0
0
RES1
RES0
0
RANGE
00h
02h
DATALSB
D7
D6
D5
D4
D3
D2
D1
D0
00h
03h
DATAMSB
D15
D14
D13
D12
D11
D10
D9
D8
00h
04h
INT_LT_LSB
TL7
TL6
TL5
TL4
TL3
TL2
TL1
TL0
00h
05h
INT_LT_MSB
TL15
TL14
TL13
TL12
TL11
TL10
TL9
TL8
00h
06h
INT_HT_LSB
TH7
TH6
TH5
TH4
TH3
TH2
TH1
TH0
FFh
07h
INT_HT_MSB
TH15
TH14
TH13
TH12
TH11
TH10
TH9
TH8
FFh
TABLE 2. OPERATION MODE
0x00[7:5]
OPERATION
000
Power-down
001
Red Sensor once
010
Blue Sensor once
011
Green Sensor once
100
Reserved
101
Red Sensor continuous
110
Blue Sensor continuous
111
Green Sensor continuous
TABLE 3. INTERRUPT FLAG
0x00[2]
OPERATION
0
No Interrupt event
1
Interrupt event triggered
TABLE 4. INTERRUPT PERSISTENCE
0x00[1:0]
NUMBER OF DATA CONVERSION CYCLES
00
1
01
4
10
8
11
16
TABLE 5. ADC RESOLUTION DATA WIDTH
0x01[3:2]
INTEGRATION TIME
(ms)
RESOLUTION
00
90
16 Bits
01
5.6
12 Bits
10
0.35
8 Bits
11
0.022
4 Bits
TABLE 6. RANGE
0x01[0]
FSR
0Low
1High


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