10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs
●The AD7417 and AD7418 are 10-bit, 4-channel and single-channel ADCs with an on-chip temperature sensor that can operate from a single 2.7 V to 5.5 V power supply. The devices contain a 15 μs successive approximation converter, a 5-channel multiplexer, a temperature sensor, a clock oscillator, a track-and-hold, and a reference (2.5 V). The AD7416 is a temperature-monitoring only device in an 8-lead package.
The temperature sensor on the parts can be accessed via multiplexer Channel 0. When Channel 0 is selected and a conversion is initiated, the resulting ADC code at the end of the conversion gives a measurement of the ambient temperature (±1°C @ 25°C).
On-chip registers can be programmed with high and low temperature limits, and an open-drain overtemperature indicator (OTI) output is provided, which becomes active when a programmed limit is exceeded.
A configuration register allows programming of the sense of the OTI output (active high or active low) and its operating mode (comparator or interrupt). A programmable fault queue counter allows the number of out-of-limit measurements that must occur before triggering the OTI output to be set to prevent spurious triggering of the OTI output in noisy environments.
●FEATURES
■10-bit ADC with 15 μs and 30 μs conversion times
■Single and 4 single-ended analog input channels
■On-chip temperature sensor: −40°C to +125°C
■On-chip track-and-hold
■Overtemperature indicator
■Automatic power-down at the end of a conversion
■Wide operating supply range: 2.7 V to 5.5 V
■I2C-compatible serial interface
■Selectable serial bus address allows connection of up to 8 AD7416/AD7417 devices to a single bus
■AD7416 is a superior replacement for LM75
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