■Overview
The <MM3457> is a nearness sensor/brightness sensor which includes 2 optical sensors.
It detects the brightness of the surroundings with the brightness sensor and automatically adjusts the backlight of the display to improve power saving and ease of viewing the screen.
In addition, it distinguishes between the talking state and standby state and controls the display accordingly to prevent operation errors and realize a reduction in power consumption.
§ Features
1. |
Two built-in photodiodes to support both visible and infrared wavelengths |
2. |
LED driver capable of driving IR-LED |
3. |
Capability for low current drive suitable for mobile devices such as cell phones
(Driving Power Supply Voltage VDD = 2.25 to 3.5V) |
§ Main specifications
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Consumed current |
70µA typ. |
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Shutdown current |
0.1µA typ. |
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Power supply voltage range |
2.25 to 3.5V |
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Data update time |
52.5ms typ. |
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LED drive current |
50mA typ. (selectable from 6.25, 12.5, 25, 50 mA) |
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Brightness sensor
spectral characteristics |
Vision sensitivity characteristics
(characteristics that approximate to the human eye) |
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External dimensions |
2.0ﾗ2.1ﾗ0.6 (Unit:mm) |
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