1 Features

? Multi-drop shared bus for data communication

features

– 1-Wire interface

– Standard and overdrive data rates modes (up

to 90 kbps)

– Legacy and short addressing

– Cyclic redundancy check (CRC)

? Flexible power supply option: VDD (supply)

powered or bus powered

– 1.7 V to 5.5 V (OVD mode or bus powered)

– 2.5 V to 5.5V (STD mode)

? High accuracy temperature sensor:

– ±0.1°C (typical) from –20°C to +85°C

– ±0.3°C (maximum) from –20°C to +85°C

– ±0.4°C (maximum) from –55°C to +125°C

? 12-bit temperature resolution: 62.5 m°C (1 LSB)

? Low power

– Active current: 85 μA (typical)

– Shutdown current: 1.6 μA (typical)

– Average current: 3.85 μA at 1Hz duty cycle

– Fast conversion time: 27 ms (maximum)

? Safety and compliance

– NIST traceable

– Factory programmed non erasable 64-bit

identification number for device addressing

– IEC 61000-4-2 ESD: 8kV contact discharge

2 Applications

? Factory Automation and control

– Temperature Transmitter

– PLC, DCS & PAC

? Medical

– CPAP machine

– Electronic hospital bed & bed control

? Grid Infrastructure

– EV charging infrastructure

– Wired communication modules

? Appliances

– Refrigerator & freezer

– Air conditioner outdoor unit

– Merchant battery charger

? Building Automation

– HVAC motor control

3 Description

The TMP1820 is 1-Wire?, high-accuracy, digitaloutput

temperature sensor. The accuracy is as high

as ±0.1°C across the –20°C to +85°C or ±0.4°C

across the –55°C to +125°C temperature range.

Each device incorporates a factory-programmed 64-

bit unique identification number used for addressing

and allows NIST traceability. The 1-Wire? interface

supports both a standard communication mode for

legacy applications and an overdrive mode (with up to

90 kbps data rate) for faster communication present in

modern applications. Overdrive mode also allows the

user to lower the bus power to as low as 1.7V over

the entire temperature range.

For the simplest mode of operation, the TMP1820

1-Wire? interface only requires a single connection

and a ground return for bus-powered mode. The

combination of unique ID and bus-powered operation

can lead to cabling simplifications, which can reduce

solution complexity and cost. In applications that

require the absolute lowest power consumption, a

VDD power pin also available if a dedicated power

supply is available. Additionally, the low-noise and

precision of the TMP1820 can reduce the power

consumption of one-sample applications.