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TMP112AIDRLT Datasheet(PDF) 10 Page - Texas Instruments |
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TMP112AIDRLT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 24 page POLARITY (POL) CONVERTER RESOLUTION (R1/R0) ONE-SHOT/CONVERSION READY (OS) HIGH- AND LOW-LIMIT REGISTERS Measured Temperature T HIGH T LOW TMP112 ALERTPIN (ComparatorMode) POL=0 TMP112 ALERTPIN (InterruptMode) POL=0 TMP112 ALERTPIN (ComparatorMode) POL=1 TMP112 ALERTPIN (InterruptMode) POL=1 Read Read Time Read FAULT QUEUE (F1/F0) TMP112 SBOS473B – MARCH 2009 – REVISED JUNE 2009 ......................................................................................................................................................... www.ti.com The Polarity bit allows the user to adjust the polarity R1/R0 are read-only bits. The TMP112 converter of the ALERT pin output. If POL = 0, the ALERT pin resolution is set on start up to '11'. This sets the becomes active low, as shown in Figure 13. For POL temperature register to a 12 bit-resolution. = 1, the ALERT pin becomes active high, and the state of the ALERT pin is inverted. The TMP112 features a One-Shot Temperature Measurement mode. When the device is in Shutdown mode, writing a '1' to the OS bit starts a single temperature conversion. During the conversion, the OS bit reads '0'. The device returns to the shutdown state at the completion of the single conversion. After the conversion, the OS bit reads '1'. This feature is useful for reducing power consumption in the TMP112 when continuous temperature monitoring is not required. As a result of the short conversion time, the TMP112 can achieve a higher conversion rate. A single conversion typically takes 26ms and a read can take place in less than 20 µs. When using One-Shot mode, 30 or more conversions per second are possible. In Comparator mode (TM = 0), the ALERT pin becomes active when the temperature equals or exceeds the value in THIGH and generates a consecutive number of faults according to fault bits F1 and F0. The ALERT pin remains active until the temperature falls below the indicated TLOW value for Figure 13. Output Transfer Function Diagrams the same number of faults. In Interrupt mode (TM = 1), the ALERT pin becomes active when the temperature equals or exceeds the value in THIGH for a consecutive number of fault A fault condition exists when the measured conditions (as shown in Table 9). The ALERT pin temperature exceeds the user-defined limits set in the remains active until a read operation of any register THIGH and TLOW registers. Additionally, the number of occurs, or the device successfully responds to the fault conditions required to generate an alert may be SMBus Alert Response address. The ALERT pin is programmed using the fault queue. The fault queue is also cleared if the device is placed in Shutdown provided to prevent a false alert as a result of mode. Once the ALERT pin is cleared, it becomes environmental noise. The fault queue requires active again only when temperature falls below TLOW, consecutive fault measurements in order to trigger and remains active until cleared by a read operation the alert function. Table 9 defines the number of of any register or a successful response to the measured faults that may be programmed to trigger SMBus Alert Response address. Once the ALERT an alert condition in the device. For THIGH and TLOW pin is cleared, the above cycle repeats, with the register format and byte order, see the High- and ALERT pin becoming active when the temperature Low-Limit Registers section. equals or exceeds THIGH. The ALERT pin can also be cleared by resetting the device with the General Call Table 9. TMP112 Fault Settings Reset command. This action also clears the state of F1 F0 CONSECUTIVE FAULTS the internal registers in the device, returning the device to Comparator mode (TM = 0). 0 0 1 0 1 2 1 0 4 1 1 6 10 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): TMP112 |
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