AT30TS74 9- to 12-bit Selectable, ±1.0°C Accurate Digital Temperature Sensor
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Features • Single 1.7V to 5.5V Supply • Measures Temperature From -55°C to +125°C • Highly Accurate Temperature Measurements Requiring No External Components - ±1.0°C Accuracy (Typical) Over the -20°C to +100°C Range - ±1.0°C Accuracy (Typical) Over the -10°C to +100°C Range (WLCSP Only) • User-configurable Resolution - 9 to 12 bits (0.5°C to 0.0625°C) • User-configurable High and Low Temperature Limits • ALERT Output Pin for Indicating Temperature Alarms • 2-Wire I2C and SMBus™ Compatible Serial Interface - Supports SMBus Timeout - Supports SMBus Alert and Alert Response Address (ARA) - Selectable Addressing Allows Up to Eight Devices on the Same Bus • I2C High-Speed (HS) Mode Compatible - 3.4MHz Maximum Clock Frequency • Built-in noise Suppression Filtering for Clock and Data Input Signals • Low-power Dissipation - 85pA Active Current (Typical) During Temperature Measurements • Shutdown Mode to Minimize Power Consumption - 1 pA Shutdown Current (Typical) • One-Shot Mode for Single Temperature Measurement While in Shutdown Mode • Pin and Software Compatible to Industry-standard LM75-type Devices • Industry Standard Green (Pb/Halide-free/RoHS Compliant) Package Options - 8-lead SOIC (150mil) 8-lead MSOP (3.0 x 3.0mm) - 8-pad Ultra Thin DFN (UDFN — 2.0 x 3.0 x 0.6mm) 4-ball WLCSP 5-ball WLCSP

Description The Atmel® AT30TS74 is a complete, precise temperature monitoring device designed for use in a variety of applications which require the measuring of local temperatures as an integral part of the system's function and/or reliability. The AT30TS74 device combines a high-precision digital temperature sensor, programmable high and low temperature alarms, and a 2-Wire I2C and SMBus (System Management Bus) compatible serial interface into a single compact package. The temperature sensor can measure temperatures over the full -55C to +125C temperature range and has a maximum...

Pointer Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.1 OS Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.2 R1:R0 Bits . . . . . ....

Atmel Ordering Code Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Green Package Options (Pb/Halide-free/RoHS Compliant) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Part Marking Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Pin Descriptions and Pinouts Table 1. Pin Description

Note: Drawings are not to scale. Block Diagram Figure 2-1. Block Diagram Pointer Register Configuration Register THIGH Limit Register TLOW Limit Register I2C/SMBus Interface Control and Logic Temperature Sensor Temperature Register Digital Comparator

Device Communication The AT30TS74 operates as a slave device and utilizes a simple 2-Wire I2C and SMBus compatible digital serial interface to communicate with a host controller, commonly referred to as the bus Master. The Master initiates and controls all Read and Write operations to the slave devices on the serial bus, and both the Master and the slave devices can transmit and receive data on the bus. The serial interface is comprised of just two signal lines:   Serial Clock (SCL): The SCL pin is used to receive the clock signal from the Master. Serial Data (SDA): The bidirectional SDA...

3.4 No-Acknowledge (NACK) When the AT30TS74 is transmitting data to the Master, the Master can indicate it is done receiving data and wants to end the operation by sending a NACK response to the AT30TS74 instead of an ACK response. This is accomplished by the Master outputting a Logic 1 during the ACK/NACK clock cycle. At which point, the AT30TS74 will release the SDA line so the Master can then generate a Stop condition. In addition, the AT30TS74 can use a NACK to respond to the Master instead of an ACK for certain invalid operation cases such as an attempt to write to a Read-only Register...

4. Device Operation Commands used to configure and control the operation of the AT30TS74 are sent to the device from the Master via the serial interface. Likewise, the Master can read the temperature data from the AT30TS74 via the serial interface. However, since multiple slave devices can reside on the serial bus, each slave device must have its own unique 7-bit address so that the Master can access each device independently. For the AT30TS74, the first four MSBs of its 7-bit address are the device type identifier and are fixed at 1001. The remaining three LSBs correspond to the states of...

AT30TS74 WLCSP Device Addresses Note: Please contact Atmel for availability of slave address options 011,100,101,110, and 111. 4.2 High-Speed Mode The AT30TS74 supports the I2C High-Speed (HS) mode allowing it to operate at clock frequencies up to 3.4MHz. In order to put the AT30TS74 into the HS mode, the Master must first initiate a Start condition followed by the HS mode master code of 00001XXX. Since the HS mode master code is meant to be recognized by all slave devices which support the HS mode, the AT30TS74 will not ACK the HS mode master code. Instead, the Master will output a NACK...

NACK from Master Repeated Start by Master Temperature Measurements The AT30TS74 utilizes a band-gap type temperature sensor with an internal sigma-delta Analog-to-Digital Converter (ADC) to measure and convert the temperature reading into a digital value with a selectable resolution as high as 0.0625C. The measured temperature is calibrated in degrees Celsius; therefore, a lookup table or conversion routine is necessary for applications that wish to deal in degrees Fahrenheit. The result of the digitized temperature measurements are stored in the internal Temperature Register of the...