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TMP461-SP

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SBOS876B – SEPTEMBER 2017 – REVISED FEBRUARY 2020

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7.6.1.4 Configuration Register

The configuration register sets the temperature range, the ALERT/THERM modes, and controls the shutdown

mode. The configuration register is set by writing to pointer address 09h, and is read by reading from pointer

address 03h. Table 7 summarizes the bits of the configuration register.

Table 7. 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 7 is configured as the ALERT output). If pin 7 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-SP device converts continuously at the rate set in the conversion rate register. When SD is set to 1, the

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

mode. When SD is set to 0 again, the TMP461-SP 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 7. If the ALERT/THERM2 bit is 0 (default), then pin 7 is

configured as the ALERT output; if this bit is set to 1, then pin 7 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-SP 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-SP device for the

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

format (see Table 2).

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.