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.