BH1603FVC-TR Rohm Semiconductor, BH1603FVC-TR Datasheet - Page 5

• Manufacturer Part Number: BH1603FVC-TR
• Description: Industrial Optical Sensors Ambient Light Sensor Analog Current Out
• Manufacturer: Rohm Semiconductor
• Type: Ambient Light Sensor with Analog Outputr
• Series: -r

Specifications of BH1603FVC-TR

• Product: Ambient Light Sensor
• Supply Voltage Range: 2.4V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SOP
• No. Of Pins: 6
• Sensor Case Style: SOP
• Supply Voltage Max: 5.5V
• Sensitivity: ±15%
• Wavelength: 560nm
• Output Type: Current
• Package / Case: 6-WSOF Exposed Pad
• Interface Type: I2C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

2) Approximate formula of IOUT output voltage in each Gain Mode
3) C1
(1) H-Gain mode
The output voltage is calculated as below.
Viout= 0.6 x 10
(2) M-Gain mode
The output voltage is calculated as follows.
Viout= 0.06 x 10
(3) L-Gain mode
The output voltage is calculated as follows.
Viout= 0.006 x 10
This device will be mounted under the optical window in actual designing. Therefore, there is a possibility that
the illuminace to ALS( Ambient Light Sensor) will be less than the illuminance on the final product surface.
Please consider the attenuation of light through the optical window.
Please set output resistance value( R1) within the range of 1 kΩ ~ 1MΩ which needs to be smaller than the
input impedance of the next circuit.
In case IOUT output is R1 only and an ALS receives the artificial lights such as fluorescent lamps and incandescent
lamps synchronized with 50/60 Hz of AC power supplies, the output current has a ripple. Therefore, please add C1
to R1 in parallel if necessary.
When you control back light by using illuminance value, C1 is effective to control smoothly for a rapid changing of
the illuminance. In general, please set it to C1 x R1 = about 1 ～ 10 as a time constant. In this case, the rise
time becomes slow at power-on and recovery from shutdown mode to operation mode.
(For example) In case you want to convert the illuminance value up to 500 lx by ADC.
If the maximum voltage of ADC input is 2V, output resistor value will be as below.
Viout is IOUT output voltage
R1 is IOUT output resistor[Ω].
R1 = Viout/(0.6 x 10
= 2 /(0.6 x 10
-6
-6
x Ev x R1
-6
x Ev x R1
x Ev x R1
-6
x 500) = 6667[Ω]
-6
x Ev)
[V]. Ev is an illuminance of the ALS surface [lx].
⇒6.8[kΩ]
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