MAXIM MAX6691 Manual
Update: 30 September, 2023
MAX6691 is a four-channel thermistor temperature-to-pulse-width converter that measures the temperatures of up to four thermistors and converts them to a series of output pulses whose widths are related to the thermistors' temperatures. Each of the four thermistors and an external fixed resistor (REXT) form a voltage-divider that is driven by the MAX6691's internal voltage reference (VREF). VREF and the voltage across REXT are measured and converted to a pulse. The MAX6691 has a single open-drain I/O pin that can be readily connected to a variety of microcontrollers. The microcontroller initiates a conversion by pulling the I/O pin low and releasing it. When conversion is done, the MAX6691 signals the end of conversion by pulling the I/O pin low once again. The pulse corresponding to the first thermistor is sent immediately after the release of the I/O pin. The on-chip power-management circuitry reduces the average thermistor current to minimize errors due to thermistor self-heating. Between conversions, the MAX6691 falls into a 10µA (max) sleep mode, where the voltage reference is disabled and the supply current is at its minimum. The MAX6691 is available in a 10-pin µMAX package and is specified from -55°C to +125°C temperature range.
Brand: MAXIM
File format: PDF
Size: 121 KB
MD5 Checksum: B7C6C01A5CACBDA9BE6C8B1F4C9612AB
Publication date: 09 April, 2012
Downloads: -
PDF Link: MAXIM MAX6691 Manual PDF