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TMP141AIDBVTG4 Datenblatt(PDF) 11 Page - Texas Instruments |
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TMP141AIDBVTG4 Datenblatt(HTML) 11 Page - Texas Instruments |
11 / 24 page TMP141 SBAS347A − MARCH 2005 − REVISED JULY 2006 www.ti.com 11 Register 4: Device Status (Read-Only) This is an 8-bit register with the following bits defined: Bit 7, Bus Error (BER): This bit is set whenever there is an error indication in the Acknowledge bit of either received or transmitted data. A bus error is cleared when the master reads the Device Status Register or sends Device Reset. Bits 6−5: Reserved. These bits read as ‘0’. Bit 4, Overrun (ORUN): This flag is set when another temperature conversion is completed before the previous conversion has been read by the master. This error is cleared by Device Reset, or by reading the temperature result from the Temperature Readout register. Bits 3−1: Reserved. These bits read as ‘0’. Bit 0, Status Function 1 (SF1): This flag is set when a temperature conversion is completed, and the data is stored in the Readout register. It is reset either when the master reads the temperature conversion, or when the TMP141 is reset. Register 5: Device Control (Read/Write) Bits 15−5: Reserved. These bits read as ‘0’. Bit 4, Enable Function 1 (ENAB): This bit enables temperature measurement; the default setting is disabled. To begin temperature measurement, a ‘1’ must be written to this bit. The enable sensor bit (EN_S) in the Temperature Control register must also be set to enable the sensor. (Bits cannot be written individually; a Write operation affects the entire register.) Bit 3: Reserved. This bit reads as ‘0’. Bit 2, Low-Power Mode: When this bit is set, the operation of all functions slow down in order to conserve power. Default is ‘0’ for normal speed operation. (See Table 4.) Bit 1, Shutdown: When this bit is set, all functions are disabled, placing the TMP141 in the lowest possible power consumption mode. Default is ‘0’; this is normal operation. To exit shutdown, write a ‘0’ to this location. Bit 0, Reset: When this bit is set, the TMP141 performs a Device Reset. During Reset, any operation is progress is aborted, and all registers are set to their default values. This bit self-clears when the Reset operation is completed. It is not necessary to do a Device Reset after power-up. Bits 1−0: These bits are the only location in the TMP141 that accepts a broadcast Write message. Register 8: Temperature Capabilities (Read-Only) Bits 15−9: Reserved. These bits read as ‘0’. Bit 8: This bit is set, indicating that the internal temperature sensing is the only option available. Bit 7: This bit is ‘0’; it indicates that the TMP141 Tempera- ture Readout register is 16 bits. Bit 6: This bit is set to indicate that signed two’s complement is the format of the temperature data. Bits 5−3: These bits are 001b; they indicate that the temperature data is 10 bits long. Bits 2−0: These bits are 010b, and indicate that the temperature data resolution is 0.25 °C. Register 9: Temperature Readout (Read-Only) The TMP141 outputs 10 bits of precision to a resolution of 0.25 °C. This 10-bit format covers a range from +127.75°C to −128 °C. Negative numbers are in two’s complement. Table 3 shows some examples of the Temperature Data format. Data is left-justified, meaning that the ten bits of data are in the most significant bits of this register. The temperature data is contained in Bits 15:6. Bits 5:0 always read as ‘0’. Table 3. Data Format Example TEMPERATURE BINARY HEX +127.75 °C(1) 01 1111 1111 1FFh +125.00 °C 01 1111 0100 1F4h +100.0 °C 01 1001 0000 190h +1.0 °C 00 0000 0100 004h +0.25 °C 00 0000 0001 001h 0 °C 00 0000 0000 000h −0.25 °C 11 1111 1111 3FFh −1.0 °C 11 1111 1100 3FCh −100 °C 10 0111 0000 270h −128 °C(1) 10 0000 0000 200h (1) Both −128°C and +127.75°C are beyond the specified operating range of −40 °C to +125°C. This table only illustrates the format of the data. |
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