ISL29021IROZ-T7 Intersil, ISL29021IROZ-T7 Datasheet - Page 6

• Manufacturer Part Number: ISL29021IROZ-T7
• Description: IC SENSOR LIGHT-DGTL I2C 8ODFN
• Manufacturer: Intersil

Specifications of ISL29021IROZ-T7

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Register Set
There are eight registers that are available in the ISL29021. Table 1 summarizes their functions.
Command Register I 00(hex)
The first command register has the following functions:
1. Operation Mode: Bits 7, 6, and 5.These three bits
2. Interrupt flag; Bit 2. This is the status bit of the interrupt.
3. Interrupt persist; Bits 1 and 0. The interrupt pin and the
ADDR
BITS 7 TO 5
00h
01h
02h
03h
04h
05h
06h
07h
determines the operation mode of the device.
The bit is set to logic high when the interrupt thresholds
have been triggered, and logic low when not yet triggered.
Once triggered, INT pin stays low and the status bit stays
high. Both interrupt pin and the status bit are automatically
cleared at the end of Command Register I transfer.
interrupt flag is triggered/set when the data sensor
reading is out of the interrupt threshold window after m
consecutive number of integration cycles. The interrupt
persist bits determine m.
000
001
010
100
101
011
110
111
BIT 2
0
1
INT_HT_MSB
COMMANDII
INT_LT_MSB
INT_HT_LSB
COMMANDI
INT_LT_LSB
REG NAME
DATA
DATA
Power-down the device
Reserved (Do not use)
IR once
Proximity once
Reserved (Do not use)
Reserved (Do not use)
IR continuous
Proximity continuous
TABLE 2. OPERATION MODE
TABLE 3. INTERRUPT FLAG
MSB
LSB
Interrupt is cleared or not triggered yet
Interrupt is triggered
TH15
TL15
OP2
D15
TH7
TL7
D7
7
1
6
OPERATION
OPERATION
FREQ
TH14
TL14
OP1
TH6
D14
TL6
D6
6
TH13
TL13
OP0
TH5
D13
TL5
IS1
D5
5
TABLE 1. REGISTER SET
ISL29021
TH12
TL12
TH4
D12
TL4
IS0
D4
4
0
.
Command Register II 01(hex)
The second command register has the following functions:
1. Proximity Sensing Scheme: Bit 7. This bit programs the
2. Modulation Frequency: Bits 6. This bit sets the IR LED
3. Amplitude of IR driver current: Bits 5 and 4. This device
BITS 1 TO 0
function of the proximity detection. Logic 1 of this bit,
Scheme 1, makes n-1 (3, 7, 11, 15) bits (2’s
complementary) proximity_less_ambient detection. The
range of Scheme 1 proximity count is from -2
2
the ambient IR noise variation.
driver’s modulation frequency.
provides current source to drive an external IR LED. The
drive capability can be programmed through Bits 5 and 4.
For example, the device sources 12.5mA out of the IRDR
pin if Bits 5 and 4 are 0.
RES1
TH11
TL11
(n-1)
TH3
BITS 6
D11
TL3
BIT
D3
BIT 7
3
0
00
01
10
11
0
1
0
1
, Scheme 1 proximity detection is less affected by
TABLE 5. PROXIMITY SENSING SCHEME
TABLE 6. MODULATION FREQUENCY
TABLE 4. INTERRUPT PERSIST
FLAG
RES0
TH10
TL10
D10
TH2
TL2
D2
Reserved
Sensing IR from LED with ambient IR rejection
2
NUMBER OF INTEGRATION CYCLES
MODULATION FREQUENCY
RANGE1
PRST1
TH1
TH9
TL1
TL9
D1
D9
1
OPERATION
(kHz)
360
DC
16
RANGE0
1
4
8
PRST0
TH0
TH8
TL0
TL8
D0
D8
0
(n-1)
DEFAULT
March 3, 2009
FFh
FFh
00h
00h
00h
00h
00h
00h
FN6732.0
to