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ADT7461AARMZ Arkusz danych(PDF) 3 Page - Analog Devices |
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ADT7461AARMZ Arkusz danych(HTML) 3 Page - Analog Devices |
3 / 24 page ADT7461A Rev. A | Page 3 of 24 GENERAL DESCRIPTION The ADT7461A1 is a dual-channel digital thermometer and undertemperature/overtemperature alarm, intended for use in PCs and thermal management systems. It is pin- and register- compatible with the ADM1032 and the ADT7461. A feature of the ADT7461A is series resistance cancellation, where up to 1.5 kΩ (typical) of resistance in series with the temperature monitoring diode can be automatically cancelled from the temperature result, allowing noise filtering. The ADT7461A has a configurable ALERT output and an extended, switchable temperature meas- urement range. The ADT7461A can measure the temperature of a remote thermal diode accurate to ±1°C and the ambient temperature accurate to ±3°C. The temperature measurement range defaults to 0°C to +127°C, compatible with the ADM1032, but it can be switched to a wider measurement range of −64°C to +191°C. The ADT7461A communicates over a 2-wire serial interface, compatible with system management bus (SMBus) standards. The default SMBus address of the ADT7461A is 0x4C. An ADT7461A-2 is available with an SMBus address of 0x4D. This is useful if more than one ADT7461A is used on the same SMBus. An ALERT output signals when the on-chip or remote tempera- ture is out of range. The THERM output is a comparator output that allows on/off control of a cooling fan. The ALERT output can be reconfigured as a second THERM output, if required. 1 Protected by U.S. Patents 5,195,827; 5,867,012; 5,982,221; 6,097,239; 6,133,753; 6,169,442; 7,010,440 ; other patents pending. DIFFERENCES BETWEEN THE ADT7461A AND THE ADT7461 Although the ADT7461A is pin- and register-compatible with the ADT7461, there are some specification differences between the two devices. A summary of these differences is shown in Table 1. Table 1. Differences Between the ADT7461A and the ADT7461 Specification ADT7461A ADT7461 Unit Supply Voltage 3 to 3.6 3 to 5.5 V Maximum Local Sensor Accuracy 1 3 °C Maximum Series Resistance Cancellation 1.5 3 k Ω Average Operating Supply Current 16 Conversions/sec 240 170 μA Standby Mode 5 5.5 μA Maximum Conversion Time One Shot, Averaging On 52 114.6 ms One Shot, Averaging Off 8 12.56 ms Remote Sensor Current Levels High 220 96 μA Mid 82 36 μA Low 13.5 6 μA |
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