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ISL29011IROZ-EVALZ Datasheet(PDF) 11 Page - Intersil Corporation

Part # ISL29011IROZ-EVALZ
Description  Digital Ambient Light Sensor and Proximity Sensor with Interrupt Function
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL29011IROZ-EVALZ Datasheet(HTML) 11 Page - Intersil Corporation

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ISL29018
11
FN6619.4
October 8, 2012
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.
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.
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.
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 0 of this bit, Scheme 0, makes
full n (4, 8, 12, 16) bits (unsigned) proximity detection. The range
of Scheme 0 proximity count is from 0 to 2n. 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). The sign bit is extended
for resolutions less than 16. While Scheme 0 has wider dynamic
range, Scheme 1 proximity detection is less affected by the
ambient IR noise variation.
2. Modulation Frequency: Bits 6. This bit sets the IR LED driver’s
modulation frequency.
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.
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.
5. Range: Bits 1 and 0. The Full Scale Range (FSR) can be
adjusted via I2C using Bits 1 and 0. Table 9 lists the possible
values of FSR for the 499k
Ω REXT resistor.
TABLE 2. OPERATION MODE
BITS 7 TO 5
OPERATION
000
Power-down the device
001
ALS once
010
IR once
011
Proximity once
100
Reserved (Do not use)
101
ALS continuous
110
IR continuous
111
Proximity continuous
TABLE 3. INTERRUPT FLAG
BIT 2
OPERATION
0
Interrupt is cleared or not triggered yet
1
Interrupt is triggered
TABLE 4. INTERRUPT PERSIST
BITS 1 TO 0
NUMBER OF INTEGRATION CYCLES
00
1
01
4
10
8
11
16
TABLE 5. PROXIMITY SENSING SCHEME
BIT 7
OPERATION
0
Sensing IR from LED and ambient
1
Sensing IR from LED with ambient IR rejection
TABLE 6. MODULATION FREQUENCY
BITS 6
MODULATION FREQUENCY
(kHz)
0DC
1
360
TABLE 7. CURRENT SOURCE CAPABILITY AT IRDR PIN
BITS 5 TO 4
IRDR PIN SOURCE CURRENT
00
12.5mA IR LED driver
01
25mA IR LED driver
10
50mA IR LED driver
11
100mA IR LED driver
TABLE 8. RESOLUTION/WIDTH
BITS 3 TO 2
NUMBER OF CLOCK CYCLES
n-BIT ADC
00
216 = 65,536
16
01
212 = 4,096
12
10
28 = 256
8
11
24 = 16
4


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