ISL29021 Ver la hoja de datos (PDF) - Renesas Electronics
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ISL29021 Datasheet PDF : 12 Pages
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ISL29021
Register Set
There are eight registers that are available in the ISL29021. Table 1 summarizes their functions.
TABLE 1. REGISTER SET
BIT
ADDR REG NAME
7
6
5
4
3
2
1
00h COMMANDI OP2
OP1
OP0
0
0
FLAG
PRST1
01h COMMANDII
1
FREQ
IS1
IS0
RES1
RES0 RANGE1
02h
DATALSB
D7
D6
D5
D4
03h
DATAMSB
D15
D14
D13
D12
04h INT_LT_LSB TL7
TL6
TL5
TL4
D3
D2
D1
D11
D10
D9
TL3
TL2
TL1
05h INT_LT_MSB TL15
TL14
TL13
TL12
TL11
TL10
TL9
06h INT_HT_LSB TH7
TH6
TH5
TH4
TH3
TH2
TH1
07h INT_HT_MSB TH15
TH14
TH13
TH12
TH11
TH10
TH9
0
PRST0
RANGE0
D0
D8
TL0
TL8
TH0
TH8
DEFAULT
00h
00h
00h
00h
00h
00h
FFh
FFh
Command Register I 00(hex)
The first command register has the following functions:
1. Operation Mode: Bits 7, 6, and 5.These three bits
determines the operation mode of the device.
BITS 7 TO 5
000
001
010
011
100
101
110
111
TABLE 2. OPERATION MODE
OPERATION
Power-down the device
Reserved (Do not use)
IR once
Proximity once
Reserved (Do not use)
Reserved (Do not use)
IR continuous
Proximity continuous
2. Interrupt flag; Bit 2. This is the status bit of the interrupt. 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.
TABLE 3. INTERRUPT FLAG
BIT 2
OPERATION
0
Interrupt is cleared or not triggered yet
1
Interrupt is triggered
3. Interrupt persist; Bits 1 and 0. The interrupt pin and the
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.
.
TABLE 4. INTERRUPT PERSIST
BITS 1 TO 0
NUMBER OF INTEGRATION CYCLES
00
1
01
4
10
8
11
16
Command Register II 01(hex)
The second command register has the following functions:
1. Proximity Sensing Scheme: Bit 7. This bit programs the
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(n-1) to 2(n-1),
Scheme 1 proximity detection is less affected by the
ambient IR noise variation.
TABLE 5. PROXIMITY SENSING SCHEME
BIT 7
OPERATION
0
Reserved
1
Sensing IR from LED with ambient IR rejection
2. Modulation Frequency: Bits 6. This bit sets the IR LED
driver’s modulation frequency.
TABLE 6. MODULATION FREQUENCY
BITS 6
MODULATION FREQUENCY
(kHz)
0
DC
1
360
3. Amplitude of IR driver current: Bits 5 and 4. This device
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.
FN6732 Rev 0.00
March 3, 2009
Page 6 of 12
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