TMP141 datasheet(12/19 Pages) TI

12 / 19 page

TMP141

SBAS347 − MARCH 2005

www.ti.com

Bits 15−2: Reserved. These bits read as ‘0’.

Bit 1, Enable Sensor (EN_S): Default is ‘0’, which is the

disabled state. In addition to setting this bit, the enable bit

in register 5 must also be set in order to measure

temperature.

Bit 0, Attention Enable (AT_E): Default is disabled.

When this bit is set, and the sensor is enabled (bit 1), the

TMP141 will generate Attention Requests. If enabled, an

Attention Request will be generated when a bit is set in the

Device Status register (register 4). See Figure 5 for the

details on the conditions for generating an Attention

Request.

Note: A bus error always attempts to generate an Attention

Request.

(For

information

the

Attention

Request

conditions, see the flowcharts in Figure 4 and Figure 5,

and the information on Exception Handling on page 14.)

The rules for generating an Attention Request are

different, depending on whether it was caused by a bus

error or a temperature conversion. A bus error always

attempts to generate an Attention Request, whereas a

conversion or a conversion overrun has several conditions

that may prevent the assertion of Attention Request.

These differences are illustrated in Figure 4 and Figure 5.

The conversion rate is controlled by both the low-power bit

in the Device Control register, and the Conversion Rate

setting in the Conversion Rate register. This register is

device-specific,

and therefore not defined by the

SensorPath specification. The conversion rate for a given

application is chosen based on system requirements and

limitations, such as the thermal response time of the

system (including the TMP141).

Table 4. Conversion Time Settings

LOW-POWER

MODE

(register 5, bit 2)

CONVERSION

RATE SETTING

(register 20h, bits

1−0 binary)

TYPICAL

CONVERSION

TIME

(ms)

382

190 (default)

766

382

1532

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