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LM74CIBP-5 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM74CIBP-5 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 15 page Typical Performance Characteristics Average Power-On Reset Voltage vs Temperature Static Supply Current vs Temperature (SO-8) 10090923 10090921 Static Supply Current vs Temperature (micro SMD) Temperature Error (SO-8) 10090925 10090922 1.0 Functional Description The LM74 temperature sensor incorporates a band-gap type temperature sensor and 12-bit plus sign ∆Σ ADC (Delta- Sigma Analog-to-Digital Converter). Compatibility of the LM74’s three wire serial interface with SPI and MICROWIRE allows simple communications with common microcontrol- lers and processors. Shutdown mode can be used to opti- mize current drain for different applications. A Manufacture’s/ Device ID register identifies the LM74 as National Semiconductor product. 1.1 POWER UP AND POWER DOWN When the supply voltage is less than about 1.6V (typical), the LM74 is considered powered down. The LM74 always powers up in a known state. When the supply voltage rises above 1.6V (typical), an internal Power-On Reset (POR) occurs and the temperature register will then contain a value of 1111 1111 0000 00XX, where XX indicates undefined values. See Section 1.5.2 for a diagram of the Temperature Regisiter contents after POR but before completion of the first temperature conversion. The LM74 power-up default condition is continuous conver- sion mode. After completion of the first full temperature conversion, the register will contain temperature measure- ment data in bits D15 (the temperature data MSB) through D3 (the temperature data LSB). Bit D2 will be fixed high; bits D1 and D0 are undefined. See Section 1.5.3 for a diagram of the Temperature Regisiter contents after the first complete temperature conversion. Note that bit D2 represents a com- plete conversion flag. During POR it is low and, after the first temperature conversion is complete, it goes high. This bit can be polled to indicate when the POR data in the Tem- perature Register has been replaced with valid temperature data. After the first conversion, and any subsequent conversions, the value in the temperature register does not change until the completion of the next conversion, at which time the temperature register is updated with the latest temperature value. 1.2 SERIAL BUS INTERFACE The LM74 operates as a slave and is compatible with SPI or MICROWIRE bus specifications. Data is clocked out on the falling edge of the serial clock (SC), while data is clocked in on the rising edge of SC. A complete transmit/receive com- www.national.com 8 |
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