TMD27711

TMD27711

Part Number: TMD27711

Manufacturer: AMS OSRAM

Description: SENSOR OPT 625NM AMBIENT MODULE

Shipped from: Shenzhen/HK Warehouse

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TMD27711 Description

The TMD2771 device family includes an entire digital proximity detection system, digital interface logic, and digital ambient light sensing (ALS) in a convenient 8-pin package. It has a LED driver, digital proximity sensor, and infrared LED; all of them have been cut down to eliminate the need to calibrate the end equipment because of differences in the parts. Thanks to its excellent background light rejection, the device can function in various settings, from direct sunlight to entirely dark rooms.

Due to the high dynamic range, applications like cell phone detection at close range are possible (behind dark glass). The device can enter a low-power mode between ALS and proximity measurements thanks to an internal state machine, resulting in low average power consumption. The device is beneficial for managing the display to conserve power and improve readability under varying lighting conditions. The display panel and keyboard backlighting can consume up to 30–40% of the total platform power. Devices like laptop computers, LCD screens, flat-screen TVs, and mobile phones would benefit significantly from the ALS features.

The function’s intent is to be used in near-field proximity applications. When a user puts their cell phone up to their ear, the device’s proximity sensor picks up on it. The device must be quick enough to provide proximity data at a high repetition rate to answer a phone call. With this, users can lock their computers when they aren’t around to protect them and maximize green power savings. Micro-optical lenses integrated into the device allow for highly efficient infrared energy transmission and reception, reducing power loss.

TMD27711 Benefits

  • A module can save time and room on the board during the design process.
  • Allows Usage in Low-Luminance or No-Luminance Conditions.
  • Provides reliable sensing through or around spectrally-displacing objects (e.g., dark glass).
  • With a properly calibrated starting point, there is no need for the final product to be calibrated by the customer.

TMD27711 Features

  • Integrated IR LED, Proximity Sensor, and Ambient Light Sensor.
  • Dual-diodes, the technology behind a patent for ambient light sensing.
  • Consistent Proximity Readings were Obtained Through Calibration and Adjustment.
  • Drive Current for LEDs That Can Be Set.

Detailed Description

The photodiodes, op-amps, ADCs, counters, timers, comparators, buffers, state machine, and I2C interface are all included in the light-to-digital converter chip. Each device’s photodiode (CH0) responds to visible and infrared light, while the other (CH1) reacts primarily to infrared light. The amplified currents from the photodiodes are converted to a digital value at up to 16 bits of resolution by two integrating ADCs working in tandem.

Once the conversion cycle is complete, the conversion output is written to the Ch0 and Ch1 data registers. Microprocessors can read this digital output and, using an empirical formula that approximates the human eye’s response to different light levels, calculate the luminance (ambient light level in lux). An infrared LED emitting at 850 nm, a circuit for driving that LED, and a detection engine are all included in this solution for detecting objects nearby. The LED cathode (LEDK) is wired to a pin on the LED driver (LDR) for a factory-calibrated proximity of 100 mm (20 mm).

This unique current calibration method accounts for all variations in silicon, optics, package, and, most importantly, IR LED output power. Since most discrete proximity sensor solutions no longer need factory calibration, this is a huge boon. While the device is set at a specific pulse count during factory calibration, the user can adjust the number of proximity LED pulses from 1 to 255 to accommodate a range of different proximity settings. Periodically, the pulses occur every 16 seconds, and the on-time is 7.2 seconds. Connecting it to a microcontroller or embedded controller is simple, thanks to the device’s support for the I2C serial bus. This two-wire interface can support data transfer rates of up to 400 kHz. The device’s digital output is inherently more robust to background noise than an analog photodiode interface.

Level interrupts can be sent to the device via a dedicated pin. When an interrupt is enabled, and a threshold is exceeded, the interrupt pin becomes asserted and remains so until the controlling firmware resets it. The interrupt feature streamlines and improves system efficiency by eliminating the need to repeatedly poll a sensor for a light intensity or proximity value. An interrupt occurs when an ALS or proximity conversion exceeds or falls below a threshold. Furthermore, the user can determine how many consecutive thresholds must be exceeded before an interrupt is triggered by using the interrupt persistence feature, which is also programmable. Both ALS and proximity can have their custom thresholds and persistence settings.

Absolute Maximum Ratings

If the device is subjected to stresses above those specified in “Absolute Maximum Ratings,” the device may be damaged beyond repair. Indicators of emphasis only. We make no guarantees that the device will function correctly under these or any other conditions outside of those listed in Recommended Operating Conditions. Long-term use at the device’s maximum rating may reduce its dependability.

System State Machine

An internal state machine regulates ALS, detects nearby objects, and manages power consumption. The device enters sleep mode after being powered on or reset. The device enters the start state as soon as the PON bit is set. After that, it will move on to the Prox, Wait, and ALS phases. The apparatus will carry out each operation if these states are active. Once all conversions are finished, the state machine will enter a power-saving sleep mode if the PON bit is set to 0.

Photodiodes

Traditional silicon detectors have a high sensitivity to infrared light, which the human eye cannot detect. The difference between the silicon detector’s response and the perceived brightness by the human eye can cause a significant error when the infrared content of the ambient light is high (as it is with incandescent lighting). Using two photodiodes allows us to get around this issue. In contrast to the Channel 1 photodiode, primarily sensitive to infrared light, the Channel 0 photodiode can detect both visible and infrared light. A pair of integrating ADCs digitizes the currents from the photodiodes. The formula uses the two channels’ ADC digital outputs to approximate the human eye’s response in lux.

ALS Operation

The two photodiodes are integrated with analog-to-digital converters (ADCs), and the ALS gain control (AGAIN) in the ALS engine. It’s important to note that the resolution and sensitivity of an ALS reading are affected by the integration time (ATIME). Both channels’ data is written to the appropriate registers at the end of the conversion cycle (C0DATA and C1DATA). Channel count is another name for this information. For added security, the data is double-buffer transferred.

Conclusion

Tests have shown that the module can be successfully reflow soldered to a PCB substrate. Here we describe the methodology, apparatus, and components of these evaluations. Solder reflow profiles describe the maximum temperature to which components on a PCB are subjected during the soldering process. The surface temperature of the element is monitored. No more than three passes through this solder reflow profile should be made with the components.

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