TMP461_15 Datasheet, PDF(18/33 Page) Texas Instruments – TMP461 High-Accuracy Remote and Local Temperature Sensor with Pin-Programmable Bus Address

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TMP461_15 Datasheet, PDF (18/33 Pages) Texas Instruments – TMP461 High-Accuracy Remote and Local Temperature Sensor with Pin-Programmable Bus Address

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TMP461

SBOS722A â JUNE 2015 â REVISED JULY 2015

www.ti.com

8.6.1 Register Information

The TMP461 device contains multiple registers for holding configuration information, temperature measurement

results, and status information. These registers are described in Figure 17 and Table 4.

8.6.1.1 Pointer Register

Figure 17 shows the internal register structure of the TMP461 device. The 8-bit pointer register is used to

address a given data register. The pointer register identifies which of the data registers must respond to a read

or write command on the two-wire bus. This register is set with every write command. A write command must be

issued to set the proper value in the pointer register before executing a read command. Table 4 describes the

pointer register and the internal structure of the TMP461 registers. The power-on reset (POR) value of the

pointer register is 00h (0000 0000b).

Pointer Register

Local and Remote Temperature Registers

Status Register

Configuration Register

Conversion Rate Register

SDA

Local and Remote Temperature Limit Registers

One-Shot Start Register

Remote Temperature Offset Registers

Local and Remote THERM Limit Registers

I/O

Control

Interface

THERM Hysteresis Register

Consecutive ALERT Register

N-factor Correction Register

SCL

Digital Filter Register

Manufacturer ID Register

Figure 17. Internal Register Structure

8.6.1.2 Local and Remote Temperature Registers

The TMP461 device has multiple 8-bit registers that hold temperature measurement results. The eight most

significant bits (MSBs) of the local temperature sensor result are stored in register 00h, and the four least

significant bits (LSBs) are stored in register 15h (the four MSBs of register 15h). The eight MSBs of the remote

temperature sensor result are stored in register 01h, and the four LSBs are stored in register 10h (the four MSBs

of register 10h). The four LSBs of both the local and remote sensor indicate the temperature value after the

decimal point (for example, if the temperature result is 10.0625Â°C, then the high byte is 0000 1010 and the low

byte is 0001 0000). These registers are read-only and are updated by the ADC each time a temperature

measurement is completed.

When the full temperature value is needed, reading the MSB value first causes the LSB value to be locked (the

ADC does not write to it) until the LSB value is read. The same thing happens upon reading the LSB value first

(the MSB value is locked until it is read). This mechanism assures that both bytes of the read operation are from

the same ADC conversion. This assurance remains valid only until another register is read. For proper operation,

read the high byte of the temperature result first. Read the low byte register in the next read command; if the

LSBs are not needed, the register can be left unread. The power-on reset value of all temperature registers is

00h.

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