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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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SS8017TR Arkusz danych(PDF) 11 Page - Silicon Standard Corp. |
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SS8017TR Arkusz danych(HTML) 11 Page - Silicon Standard Corp. |
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11 / 16 page  www.SiliconStandard.com 11 of 16 SS8017 Rev.2.01 6/06/2003 Table 3. Data Format (Twos-Complement) DIGITAL OUTPUT DATA BITS TEMP. ( °C) ROUND TEMP. ( °C) SIGN MSB LSB +130.00 +127 0 111 1111 +127.00 +127 0 111 1111 +126.50 +127 0 111 1111 +126.00 +126 0 111 1110 +25.25 +25 0 001 1001 +0.50 +1 0 000 0001 +0.25 +0 0 000 0000 +0.00 +0 0 000 0000 -0.25 +0 0 000 0000 -0.50 +0 0 000 0000 -0.75 -1 1 111 1111 -1.00 -1 1 111 1111 -25.00 -25 1 110 0111 -25.50 -25 1 110 0110 -54.75 -55 1 100 1001 -55.00 -55 1 100 1001 -65.00 -65 1 011 1111 -70.00 -65 1 011 1111 Alarm Threshold Registers Four registers store alarm threshold data, with high-temperature (THIGH) and low-temperature (TLOW) registers for each A/D channel. If either measured tem- perature equals or exceeds the corresponding alarm threshold value, an ALERT interrupt is asserted. The power-on-reset (POR) state of both THIGH regis- ters is full scale (0111 1111, or +127°C). The POR state of both TLOW registers is 1100 1001 or -55°C. Diode Fault Alarm There is a continuity fault detector at DXP that detects whether the remote diode has an open-circuit condition. At the beginning of each conversion, the diode fault is checked, and the status byte is updated. This fault detector is a simple voltage detector; if DXP rises abo- ve VCC - 1V (typical) due to the diode current source, a fault is detected. Note that the diode fault isn't checked until a conversion is initiated, so immediately after power-on reset the status byte indicates no fault is present, even if the diode path is broken. If the remote channel is shorted (DXP to DXN or DXP to GND), the ADC reads 0000 0000 so as not to trip ei- ther the THIGH or TLOW alarms at their POR settings. In applications that are never subjected to 0°C in nor- mal operation, a 0000 0000 result can be checked to indicate a fault condition in which DXP is accidentally short circuited. Similarly, if DXP is short circuited to VCC, the ADC reads +127°C for both channels, and the device alarms. ALERT Interrupts The ALERT interrupt output signal is latched and can only be cleared by reading the Alert Response address. Interrupts are generated in response to THIGH and TLOW comparisons and when the remote diode is dis- connected (for continuity fault detection). The interrupt does not halt automatic conversions; new temperature data continues to be available over the SMBus inter- face after ALERT is asserted. The interrupt output pin is open-drain so that device can share a common in- terrupt line. The interrupt rate can never exceed the conversion rate. The interface responds to the SMBus Alert Response address, an interrupt pointer return-address feature (see Alert Response Address section). Prior to taking corrective action, always check to ensure that an in- terrupt is valid by reading the current temperature. Alert Response Address The SMBus Alert Response interrupt pointer provides quick fault identification for simple slave devices that lack the complex, expensive logic needed to be a bus master. Upon receiving an ALERT interrupt signal, the host master can broadcast a Receive Byte transmis- sion to the Alert Response slave address (0001 100). Then any slave device that generated an interrupt at- tempts to identify itself by putting its own address on the bus. |
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