TMP411CD datasheet(12/32 Pages) TI

12 / 32 page

TMP411

SBOS383C − DECEMBER 2006 − REVISED MAY 2008

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CONFIGURATION REGISTER

The Configuration Register sets the temperature range,

controls shutdown mode, and determines how the

ALERT/THERM2

functions.

The

Configuration

by reading from pointer address 03h.

The MASK bit (bit 7) enables or disables the ALERT pin

output if AL/TH = 0. If AL/TH = 1 then the MASK bit has no

effect. If MASK is set to ‘0’, the ALERT pin goes low when

one of the temperature measurement channels exceeds

its high or low limits for the chosen number of consecutive

conversions. If the MASK bit is set to ‘1’, the TMP411

retains the ALERT pin status, but the ALERT pin will not

go low.

The shutdown (SD) bit (bit 6) enables or disables the

temperature measurement circuitry. If SD = 0, the TMP411

converts continuously at the rate set in the conversion rate

stops converting and enters a shutdown mode. When SD

is set to ‘0’ again, the TMP411 resumes continuous

conversions. A single conversion can be started when

SD = 1 by writing to the One-Shot Register.

The AL/TH bit (bit 5) controls whether the ALERT pin

functions in ALERT mode or THERM2 mode. If AL/TH = 0,

the ALERT pin operates as an interrupt pin. In this mode,

the ALERT pin goes low after the set number of

consecutive

out-of-limit

temperature

measurements

occur.

If AL/TH = 1, the ALERT/THERM2 pin implements a

THERM function (THERM2). In this mode, THERM2

functions similar to the THERM pin except that the local

high limit and remote high limit registers are used for the

thresholds. THERM2 goes low when either RHIGH or

LHIGH is set.

The temperature range is set by configuring bit 2 of the

Configuration Register. Setting this bit low configures the

TMP411 for the standard measurement range (0

°C to

+127

°C); temperature conversions will be stored in the

standard binary format. Setting bit 2 high configures the

TMP411 for the extended measurement range (−55

°C to

+150

°C); temperature conversions will be 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. Table 5 summarizes the bits

of the Configuration Register.

Table 5. Configuration Register Bit Descriptions

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

BIT

NAME

FUNCTION

POWER-ON RESET VALUE

MASK

0 = ALERT Enabled

1 = ALERT Masked

0 = Run

1 = Shut Down

AL/TH

0 = ALERT Mode

1 = THERM Mode

4, 3

Reserved

—

Temperature Range

0 = 0

°C to +127°C

1 = −55

°C to +150°C

1, 0

Reserved

—

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