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AFE4405EVM
AFE4405 Integrated AFE With FIFO for Wearable Optical Heart-Rate Monitoring Evaluation Module
AFE4405EVM
Overview
The AFE4405 is an analog front-end (AFE) for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The device supports three switching light-emitting diodes (LEDs) and a single photodiode. The current from the photodiode is converted into voltage by the transimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ADC code can be stored in a 240-sample FIFO with programmable depth. The FIFO depth can be partitioned to accommodate the phases that need to be stored. The FIFO can be read out using either an I2C or a SPI interface. The AFE also has a fully- integrated LED driver with an 8-bit current control. The device can be clocked by an external clock or by internal oscillator. The device communicates to an external host processor using an I2C interface. The purpose of the AFE4405EVM is to expedite evaluation and system development activities related to AFE4405 device.
Features
- Acquire data at up to 1000 SPS in evaluation mode
- USB based power and PC application connectivity
- Access to all AFE4405 registers via an easy-to-use GUI
- USB-based firmware upgrade option
Biosensing AFEs
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Evaluation board
AFE4405EVM — AFE4405 Integrated AFE With FIFO for Wearable Optical Heart-Rate Monitoring Evaluation Module
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