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TMP461

SBOS722B – JUNE 2015 – REVISED AUGUST 2016

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8.6.1.4 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 6 summarizes the bits of the configuration register.

Table 6. 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 device converts continuously at the rate set in the conversion rate register. When SD is set to 1, the

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

mode. When SD is set to 0 again, the TMP461 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 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 device for the

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

format (see Table 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.