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| 型号： | ISL29021IROZ-EVALZ |
| 厂商： | Intersil |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR ISL29021IROZ |
| 标准包装： | 1 |
| 系列： | * |
ISL29021
.
TABLE 7. CURRENT SOURCE CAPABILITY AT IRDR PIN
Registers 06 and 07 hex set the high (HI) threshold for the
BITS 5 TO 4
00
01
10
IRDR PIN SOURCE CURRENT
12.5mA IR LED driver
25mA IR LED driver
50mA IR LED driver
interrupt pin and the interrupt flag. 06 hex is the LSB and 07
hex is the MSB. By default, the Interrupt threshold HI is FF
hex for both LSB and MSB.
Integration and Conversion Time
t int = 2 × -------------- = 2 × ----------------------------------------------
f OSC
11 100mA IR LED driver
4. Resolution: Bits 3 and 2. Bits 3 and 2 determine the ADC’s
resolution and the number of clock cycles per conversion
in Internal Timing Mode. Changing the number of clock
cycles does more than just change the resolution of the
device. It also changes the integration time, which is the
period the device’s analog-to-digital (A/D) converter
samples the photodiode current signal for a measurement.
The ADC resolution and f OSC determines the integration
time, t int .
n 1 n R EXT (EQ. 1)
725kHz × 499k Ω
where n is the number of bits of resolution and n = 4, 8, 12 or
16. 2 n , therefore, is the number of clock cycles. n can be
programmed at the command register 01(hex) bits 3 and 2.
.
TABLE 8. RESOLUTION/WIDTH
TABLE 11. INTEGRATION TIME OF n-BIT ADC
BITS 3 TO 2
00
01
10
11
NUMBER OF CLOCK CYCLES
2 16 = 65,536
2 12 = 4,096
2 8 = 256
2 4 = 16
n-BIT ADC
16
12
8
4
R EXT
(k Ω) n = 16-BIT n = 12-BIT
250 45ms 2.812ms
499** 90ms 5.63ms
**Recommended R EXT resistor value
n = 8-BIT
175.5μs
351μs
n = 4-BIT
10.8μs
21.6μs
5. Range: Bits 1 and 0. The Full Scale Range (FSR) can be
adjusted via I 2 C using Bits 1 and 0. Table 9 lists the
possible values of FSR for the 499k Ω R EXT resistor.
TABLE 9. RANGE/FSR
BITS 1:0 k RANGE(k) FSR @ IR SENSING
External Scaling Resistor R EXT for f OSC and
Range
The ISL29021 uses an external resistor R EXT to fix its
internal oscillator frequency, f OSC . Range. f OSC and Range
are inversely proportional to R EXT . For user simplicity, the
proportionality constant is referenced to 499k Ω :
Range = ------------------ × Range ( k )
f OSC = ------------------ × 725 kHz
00
01
10
11
1
2
3
4
Range1
Range2
Range3
Range4
499k Ω
R EXT
499k Ω
R EXT
(EQ. 2)
(EQ. 3)
Data Registers (02 hex and 03 hex)
The device has two 8-bit read-only registers to hold the data
from LSB to MSB for ADC. The most significant bit (MSB) is
accessed at 03 hex, and the least significant bit (LSB) is
accessed at 02 hex. For 16-bit resolution, the data is from
D0 to D15; for 12-bit resolution, the data is from D0 to D11;
for 8-bit resolution, the data is from D0 to D7. The registers
are refreshed after every conversion cycle.
TABLE 10. DATA REGISTERS
ADDRESS
Noise Rejection
In general, integrating type ADC’s have excellent
noise-rejection characteristics for periodic noise sources
whose frequency is an integer multiple of the conversion
rate. For instance, a 60Hz AC unwanted signal’s sum from
0ms to k*16.66ms (k = 1,2...k i ) is zero. Similarly, setting the
device’s integration time to be an integer multiple of the
periodic noise signal, greatly improves the proximity sensor
output signal in the presence of noise.
ADC Output in IR Sensing
(hex)
02
CONTENTS
D0 is LSB for 4, 8, 12 or 16-bit resolution, D3 is MSB
The ISL29021’s ADC output codes, DATA, are directly
proportional to the IR intensity received in the IR sensing.
for 4-bit resolution, D7 is MSB for 8-bit resolution
DATA IR = β × E IR
(EQ. 4)
03
D15 is MSB for 16-bit resolution, D11 is MSB for
12-bit resolution
Here, E IR is the received IR intensity. The constant β
changes with the spectrum of background IR noise like
Interrupt Registers (04, 05, 06 and 07 hex)
Registers 04 and 05 hex set the low (LO) threshold for the
interrupt pin and the interrupt flag. 04 hex is the LSB and 05
hex is the MSB. By default, the Interrupt threshold LO is 00
hex for both LSB and MSB.
7
sunlight and incandescent light. The β also changes with the
ADC’s range and resolution selections.
ADC Output in Proximity Sensing
In the proximity sensing, the ADC output codes, DATA, are
directly proportional to the total IR intensity from the
FN6732.0
March 3, 2009
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