TMP103CYFFR datasheet(8/23 Pages) TI

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Startup

Startof

Conversion

Delay

(1)

26ms

Measured

Temperature

HIGH

LOW

FHBit

(TransparentMode)

Read

Time

Read

FLBit

(TransparentMode)

FHBit

(LatchMode)

FLBit

(LatchMode)

TMP103

SBOS545A

– FEBRUARY 2011 – REVISED MARCH 2011

www.ti.com

CONFIGURATION REGISTER

The latch bit (LC) in the configuration register is used

to latch the value of the flag bits (FH and FL) until the

The Configuration Register is an eight-bit read/write

master issues a read command to the configuration

modes

the

temperature

sensor.

Read/write

is received by the TMP103, or if LC = '0' and the

operations are performed MSB first. The format and

temperature is within the temperature limits. The

power-up/reset value of the Configuration Register is

power-on default values for these bits are FH = '0',

shown in Table 5. All registers are updated at the end

FL = '0', and LC = '0'.

of the data byte.

CONVERSION RATE

Table 5. Configuration and Power-Up/Reset

Format

The conversion rate bits, CR1 and CR0 located in the

Configuration Register, configure the TMP103 for

conversion

rates

8Hz,

4Hz,

1Hz,

CR1

CR0

0.25Hz

(default).

The

TMP103

has

typical

conversion time of 26ms. To achieve different

conversion rates, the TMP103 performs a single

conversion and then powers down and waits for the

TEMPERATURE WATCHDOG FUNCTION

appropriate delay set by CR1 and CR0. Table 6

The TMP103 contains a watchdog function that

shows the settings for CR1 and CR0.

monitors device temperature and compares the result

to the values stored in the temperature limit registers

Table 6. Conversion Rate Settings

(THIGH and TLOW) in order to determine if the device

CR1

CR0

CONVERSION RATE

temperature

within

these

set

limits.

the

temperature of the TMP103 becomes greater than

0.25Hz (default)

the value in the THIGH register, then the flag-high bit

1Hz

(FH) in the configuration register is set to '1'. If the

4Hz

temperature falls below value in the TLOW register,

8Hz

then the flag-low bit (FL) is set to '1'. If both flag bits

remain '0', then the temperature is within the

After power-up or general-call reset, the TMP103

temperature window set by the temperature limit

immediately

starts

conversion,

shown

registers, as shown in Figure 8.

Figure 9. The first result is available after 26ms

(typical).

The

active

quiescent

current

during

conversion is 40

μA (typical at +27°C, V+ = 1.8V). The

quiescent current during delay is 1.0

μA (typical at

+27

°C, V+ = 1.8V).

(1) Delay is set by CR1 and CR0.

Figure 9. Conversion Start

SHUTDOWN MODE (M1 =

'0', M0 = '0')

Shutdown mode saves maximum power by shutting

down all device circuitry other than the serial

interface, reducing current consumption to typically

less than 0.5

μA. Shutdown mode is enabled when

Figure 8. Temperature Flag Functional Diagram

bits M1 and M0 (in the Configuration Register) = '00'.

The device shuts down when the current conversion

is completed.

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