Table 8-3. Configuration Register Bit Descriptions

CONFIGURATION REGISTER (Read = 03h, Write = 09h, POR = 00h)

BIT NUMBER

NAME

FUNCTION

POWER-ON RESET VALUE

7

MASK1

0 = ALERT enabled

1 = ALERT masked

0

6

SD

0 = Run

1 = Shut down

0

5

ALERT/ THERM2

0 = ALERT

1 = THERM2

0

4:3

Reserved

—

0

2

RANGE

0 = –40°C to +127°C

1 = –64°C to +191°C

0

1:0

Reserved

—

0

MASK1 (bit 7) of the configuration register masks the ALERT output. If MASK1 is 0 (default), the ALERT output

is enabled. If MASK1 is set to 1, the ALERT output is disabled. This configuration applies only if the value of

ALERT/ THERM2 (bit 5) is 0 (that is, pin 10 is configured as the ALERT output). If pin 10 is configured as the

THERM2 output, the value of the MASK1 bit has no effect.

The shutdown bit (SD, bit 6) enables or disables the temperature-measurement circuitry. If SD = 0 (default), the

TMP461-EP device converts continuously at the rate set in the conversion rate register. When SD is set to 1, the

TMP461-EP device stops converting when the current conversion sequence is complete and enters a shutdown

mode. When SD is set to 0 again, the TMP461-EP resumes continuous conversions. When SD = 1, a single

conversion can be started by writing to the one-shot start register; see the One-Shot Start Register section for

more information.

ALERT/ THERM2 (bit 5) sets the configuration of pin 10. If the ALERT/ THERM2 bit is 0 (default), then pin 10 is

configured as the ALERT output; if this bit is set to 1, then pin 10 is configured as the THERM2 output.

The temperature range is set by configuring RANGE (bit 2) of the configuration register. Setting this bit

low (default) configures the TMP461-EP device for the standard measurement range (–40°C to +127°C);

temperature conversions are stored in the standard binary format. Setting bit 2 high configures the TMP461-EP

device for the extended measurement range (–64°C to +191°C); temperature conversions are stored in the

extended binary format (see Table 7-1). The remaining bits of the configuration register are reserved and must

always be set to 0. The power-on reset value for this register is 00h.

8.1.5 Conversion Rate Register

The conversion rate register (read address 04h, write address 0Ah) controls the rate at which temperature

conversions are performed. This register adjusts the idle time between conversions but not the conversion time,

thereby allowing the TMP461-EP power dissipation to be balanced with the temperature register update rate.

Table 8-4 lists the conversion rate options and corresponding time between conversions. The default value of the

register is 08h, which gives a default rate of 16 conversions per second.

Table 8-4. Conversion Rate

VALUE

CONVERSIONS PER SECOND

TIME (SECONDS)

00h

0.0625

16

01h

0.125

8

02h

0.25

4

03h

0.5

2

04h

1

1

05h

2

0.5

06h

4

0.25

07h

8

0.125

08h

16 (default)

0.0625 (default)

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TMP461-EP

SNIS241 – SEPTEMBER 2025

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