GX21M15

1.Overview
GX21M15 is a temperature to digital converter that uses on-chip bandgap temperature sensors and ∑ - Δ A/D conversion technology with overheat detection output. GX21M15 contains a series of data registers: configuration registers (Conf) that store device settings such as device operating mode, OS operating mode, OS polarity, and OS fault queue; For specific description, please refer to Section 7 "Function Description". The temperature register (Temp) that stores digital temperature data and the set point registers (Tos and Thyst) that store programmable overheat shutdown thresholds and hysteresis limits can communicate with the controller through a 2-wire serial I ² C bus interface. The device also provides an open drain output (OS) that can be activated when the temperature exceeds the programming threshold limit. The temperature sensor has a total of 3 logical address pins, so up to 8 devices can be connected on the same bus without address conflicts. GX21M15 can be configured for different working modes. It can be set to normal mode to regularly monitor the ambient temperature, or set to off mode to minimize power consumption. The OS output can operate in either of two optional modes: OS comparator mode or OS interrupt mode. Its output valid state can be configured as high or low level. The number of consecutive faults that occur activates the fault queue output by the OS and the set point limit threshold are both programmable. The temperature register always stores 11 bit binary complement data, with a temperature resolution of 0.125 ℃. This higher temperature resolution is particularly useful for precise measurement of thermal drift or thermal escape applications. When accessing GX21M15, the current temperature conversion will not be interrupted (i.e., the I2C bus part is completely independent of the ∑ - Δ converter part), and GX21M15 can be accessed continuously without waiting for communication time. Even if it is a temperature conversion time, this will not prevent the device from using the new temperature conversion result to update the temperature register. After the temperature register is updated, the new conversion result can be used immediately. When GX21M15 is powered on, it is in normal operating mode, with the OS in comparator mode, a temperature threshold of 80 ℃, and a hysteresis value of 75 ℃. Therefore, it can be used as an independent thermostat with pre-defined temperature setpoints.

2. Features
The pins are fully compatible with industry standard LM75 and LM75A pins, and provide a temperature resolution of 0.125 ℃ and a power supply range of 2.8 V to 5.5 V
I2C bus interface, with a maximum of 8 devices on the same bus
Power supply voltage range: 2.8 V to 5.5 V
The temperature range is -55 ℃ to+125 ℃
The frequency range is from 20 Hz to 400 kHz, with bus fault timeout function to prevent bus suspension
Provide an 11 bit ADC with a temperature resolution of 0.125 ℃
Temperature accuracy:
From  ℃ to+50 ℃: ± 0.5 ℃
25 ℃ to+100 ℃: ± 1 ℃
55 ℃ to+125 ℃: ± 1.5 ℃
Programmable alarm temperature threshold and hysteresis value
The power supply current in shutdown mode is 0.1 µ A to achieve energy saving
When powered on, it can be used as a standalone thermostat
ESD protection exceeds JESD22-A114 4500 V HBM and JESD22-C101 1000 V CDM
According to JEDEC standard JESD78, complete latch testing exceeding 100 mA
Small 8-pin package types: SOP8, MSOP8/TSSOP8

3. Application
System thermal management
Personal computer
Electronic devices
Industrial controller

4.Order Information 

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