TMP1827 datasheet(23/65 Pages) TI

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VIL

VIH

VDD/VPUR

tSLOT

tRL

tMSW

tREC

Host Read-1

tRWAIT

VIL

VIH

VDD/VPUR

tSLOT

tMSW

tREC

Host Read-0

tRWAIT

tRL

Host drives SDQ

Device drives SDQ

High Impedance, external pullup

Figure 9-11. Host Read, Device Write

9.3.14 Bus Speed

The device supports both standard speed (8.33 kbps) and overdrive speed (90 kbps) data rates. All devices

are factory programmed to start in overdrive speed to enable higher data throughput. If the host requires the

device to operate at standard speed, then the host can easily switch the device by issuing a standard speed bus

reset. The seamless switchover allows the host to leverage better data rates on new designs, while maintaining

backward compatibility for older design.

Additionally, the device also provides the flexibility to switch from standard to overdrive speed mode using

address phase commands of OVD SKIPADDR and OVD MATCHADDR.

• When host issues OVD SKIPADDR, then all devices capable to support the overdrive mode on the bus

switch, from standard speed to overdrive speed.

• When host issues OVD MATCHADDR, then the device whose 64-bit device address matches the address

that host sends will switch from standard to overdrive speed.

9.3.15 NIST Traceability

The accuracy of temperature testing is verified with equipment that is calibrated by an accredited lab that

complies with ISO/IEC 17025 policies and procedures. Each device is tested and trimmed to conform to its

respective data sheet specification limits.

9.4 Device Functional Modes

The TMP1827 device features flexible one-shot temperature conversion modes along with robust user EEPROM

architecture, which is described in the sections below.

9.4.1 Conversion Modes

The TMP1827 supports both one-shot and continuous conversion modes. There are different methods for

one-shot conversion modes, that may be used based on single device or multiple device bus network. The

continuous conversion mode is only supported in VDD powered mode. Each of the conversion modes are with

single temperature sample, but the host can enable eight samples averages in the device for improved accuracy.

The conversion always results in a single temperature sample, but the host can enable eight samples averages

in the device to reduce conversion noise and improve accuracy.

9.4.1.1 Basic One-Shot Conversion Mode

The basic one-shot conversion mode is the default conversion mode. The device goes through a bus reset,

address and function phase to initiate the temperature conversion. During the communication, the device is in

shutdown mode. When the conversion request is registered by the device, the device starts active conversion

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TMP1827

SBOSA15A – SEPTEMBER 2022 – REVISED MAY 2023

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