Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- DESCRIPTION
- TYPICAL APPLICATION
- ABSOLUTE MAXIMUM RATINGS
- THERMAL INFORMATION
- ELECTRICAL CHARACTERISTICS
- PIN CONFIGURATION
- TYPICAL CHARACTERISTICS
- APPLICATION INFORMATION
- GENERAL DESCRIPTION
- COMMUNICATION PROTOCOL
- COMMAND REGISTER
- GLOBAL INITIALIZATION AND ADDRESS ASSIGNMENT SEQUENCE
- GLOBAL READ AND WRITE
- GLOBAL CLEAR INTERRUPT
- GLOBAL SOFTWARE RESET
- INDIVIDUAL READ AND WRITE
- TEMPERATURE REGISTER
- CONFIGURATION REGISTER
- TEMPERATURE LIMIT REGISTERS
- TIMEOUT FUNCTION
- NOISE
- SMAART WIRE INTERFACE TIMING SPECIFICATIONS
- Revision History
Startup Start of
Conversion
Delay
(1)
26 ms
26 ms
TMP104
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SBOS564A –NOVEMBER 2011– REVISED NOVEMBER 2011
Conversion Rate (CR1, CR0)
The conversion rate bits (CR1 and CR0), located in the Configuration Register, configure the TMP104 for
conversion rates of 8 Hz, 4 Hz, 1 Hz, or 0.25 Hz (default). The TMP104 has a typical conversion time of 26 ms.
To achieve different conversion rates, the TMP104 performs a single conversion and then powers down and
waits for the appropriate delay set by CR1 and CR0. Table 7 shows the settings for CR1 and CR0.
Table 7. Conversion Rate Settings
CR1 CR0 CONVERSION RATE
0 0 0.25 Hz (default)
0 1 1 Hz
1 0 4 Hz
1 1 8 Hz
After power-up or general-call reset, the TMP104 immediately starts a conversion, as shown in Figure 12. The
first result is available after 26 ms (typical). The active quiescent current during conversion is 40 μA (typical at
+25°C, V+ = 1.8 V). The quiescent current during delay is 1.0 μA (typical at +25°C, V+ = 1.8 V).
(1) Delay is set by CR1 and CR0.
Figure 12. Conversion Start
Conversion Modes
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 bits M1 and M0 (in
the Configuration Register) read '00'. The device shuts down when the current conversion is completed.
One-Shot Mode (M1 = 0, M0 = 1)
The TMP104 features a One-Shot Temperature Measurement mode. When the device is in Shutdown mode,
writing '01' to bits M1 and M0 starts a single temperature conversion. During the conversion, bits M1 and M0
read '01'. The device returns to the shutdown state at the completion of the single conversion. After the
conversion, bits M1 and M0 read '00'. This feature is useful for reducing power consumption in the TMP104
when continuous temperature monitoring is not required.
As a result of the short conversion time, the TMP104 can achieve a higher conversion rate. A single conversion
typically takes 26 ms and an individual read can take place in less than 300 μs. When using One-Shot mode, 30
or more conversions per second are possible.
Continuous Conversion Mode (M1 = 1)
When the TMP104 is in Continuous Conversion mode (M1 = 1), continuous conversions are performed at a rate
determined by the conversion rate bits, CR1 and CR0 (in the Configuration Register). The TMP104 performs a
single conversion, and then powers down and waits for the appropriate delay set by CR1 and CR0. See Table 7
for CR1 and CR0 settings.
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