TMP9R01DGSSLASHEM datasheet(29/45 Pages) TI2

29 / 45 page

Table 8-4. Conversion Rate (continued)

VALUE

CONVERSIONS PER SECOND

TIME (Seconds)

09h

0.03125

8.1.6 One-Shot Start Register

When the TMP9R01-SEP and TMP9R01-SP devices are in shutdown mode (SD = 1 in the configuration

This write operation starts one conversion and comparison cycle on either both the local and remote sensors

or on only one or the other sensor, depending on the LEN and REN values configured in the channel enable

The value of the data sent in the write command is irrelevant and is not stored by the device.

8.1.7 Channel Enable Register

The channel enable register (read address 16h, write address 16h) enables or disables the temperature

conversion of remote and local temperature sensors. LEN (bit 0) of the channel enable register enables/disables

the conversion of local temperature. REN (bit 1) of the channel enable register enables/disables the conversion

of remote temperature. Both LEN and REN are set to 1 (default), which enables the ADC to convert both local

and remote temperatures. If LEN is set to 0, the local temperature conversion is disabled, and similarly, if REN is

set to 0, the remote temperature conversion is disabled.

Both local and remote temperatures are converted by the internal ADC as a default mode. The Channel Enable

applications that do not require both remote and local temperature information.

8.1.8 Consecutive ALERT Register

The Consecutive ALERT register (read address 22h, write address 22h) controls the number of out-of-limit

temperature measurements required for ALERT to be asserted. Table 8-5 summarizes the values of the

consecutive ALERT register. The number programmed in the consecutive ALERT applies to both the remote

and local temperature results. When the number of times that the temperature result consecutively exceeds the

high limit register value is equal to the value programmed in the consecutive ALERT register, ALERT is asserted.

Similarly, the consecutive ALERT register setting is also applicable to the low-limit register.

Table 8-5. Consecutive ALERT

NUMBER OF OUT-OF-LIMIT MEASUREMENTS REQUIRED TO ASSERT ALERT

01h

1 (default)

03h

07h

0Fh

8.1.9 η-Factor Correction Register

The TMP9R01-SEP and TMP9R01-SP devices allows for a different η-factor value to be used for converting

remote channel measurements to temperature. The remote channel uses sequential current excitation to extract

a differential VBE voltage measurement to determine the temperature of the remote transistor. Equation 1 shows

this voltage and temperature.

VBE2−VBE1=ηkTqln I2I1

(1)

The value η in Equation 1 is a characteristic of the particular transistor used for the remote channel. The

power-on reset value for the TMP9R01-SEP and TMP9R01-SP devices is η = 1.008. The value in the η-factor

correction register can be used to adjust the effective η-factor according to Equation 2 and Equation 3.

ηeff= 1.008×2088

2088+NADJUST

(2)

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TMP9R01-SEP, TMP9R01-SP

SNIS238A – JULY 2025 – REVISED JULY 2026

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