ISL29120 Datasheet, PDF (5/8 Pages) Intersil Corporation – Digital Output, Low Power, Red, Green, and Blue Color Light Sensor

ISL29120
Register Set
There are eight registers that are available in the ISL29120. Table 1 summarizes their functions.
ADDR
00h
01h
02h
03h
04h
05h
06h
07h
REG NAME
COMMANDI
COMMANDII
DATA_LSB
DATA_MSB
INT_LT_LSB
INT_LT_MSB
INT_HT_LSB
INT_HT_MSB
7
OP2
0
D7
D15
TL7
TL15
TH7
TH15
6
OP1
0
D6
D14
TL6
TL14
TH6
TH14
TABLE 1. REGISTER SET
BIT
5
4
3
OP0
0
0
0
0
RES1
D5
D4
D3
D13
D12
D11
TL5
TL4
TL3
TL13
TL12
TL11
TH5
TH4
TH3
TH13
TH12
TH11
2
IFLG
RES0
D2
D10
TL2
TL10
TH2
TH10
1
PRST1
0
D1
D9
TL1
TL9
TH1
TH9
0
PRST0
RANGE
D0
D8
TL0
TL8
TH0
TH8
DEFAULT
00h
00h
00h
00h
00h
00h
FFh
FFh
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.
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
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.
TABLE 3. INTERRUPT FLAG
0x00[2]
OPERATION
0
No Interrupt event
1
Interrupt event triggered
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.
0x00[1:0]
00
01
10
11
TABLE 4. INTERRUPT PERSISTENCE
NUMBER OF DATA CONVERSION CYCLES
1
4
8
16
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.
TABLE 5. ADC RESOLUTION DATA WIDTH
0x01[3:2]
00
01
10
11
INTEGRATION TIME
(ms)
90
5.6
0.35
0.022
RESOLUTION
16 Bits
12 Bits
8 Bits
4 Bits
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 6. RANGE
0x01[0]
FSR
0
Low
1
High
5
FN8314.0
May 29, 2012