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ADT7421ARMZ-2RL Datasheet(PDF) 2 Page - ON Semiconductor |
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ADT7421ARMZ-2RL Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 20 page ADT7421 http://onsemi.com 2 Another feature of the ADT7421 is Series Resistance Cancellation, where up to 50 W (typical) of resistance in series with the temperature monitoring transistor can be automatically cancelled from the temperature result, allowing noise filtering. The combination of Beta cancellation and series resistance cancellation provides critical high accuracy temperature sensing on 45 nm CPU’s and GPU’s. The ADT7421 can measure the temperature of a remote thermal transistor accurate to ±1°C and the ambient temperature accurate to ±1°C. The temperature measurement range defaults to 0 °C to +125°C, compatible with the ADM1032, but it can be switched to a wider measurement range of −40 °C to +125°C. The ADT7421 has a configurable ALERT output and an extended, switchable temperature measurement range. The ADT7421 communicates over a 2−wire serial interface, compatible with system management bus (SMBus) standards. The default SMBus address of the ADT7421 is 0x4C. An ADT7421−2 is available with a SMBus address of 0x4D. This is useful if more than one ADT7421 is used on the same SMBus. An ALERT output signals when the on−chip or remote temperature 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. Figure 1. Block Diagram A−TO−D CONVERTER RUN/STANDBY BUSY REMOTE OFFSET REGISTER STATUS REGISTER INTERRUPT MASKING REMOTE TEMPERATURE VALUE REGISTER LOCAL TEMPERATURE VALUE REGISTER ON−CHIP TEMPERATURE SENSOR ANALOG MUX EXTERNAL DIODE OPEN−CIRCUIT SMBus INTERFACE ADT7421 3 2 8 4 1 57 VDD GND SDATA SCLK THERM 6 D+ D– ALERT/THERM2 CONFIGURATION REGISTERS EXTERNAL THERM LIMIT REGISTERS LOCAL THERM LIMIT REGISTERS REMOTE TEMPERATURE HIGH−LIMIT REGISTER REMOTE TEMPERATURE LOW−LIMIT REGISTER LOCAL TEMPERATURE HIGH−LIMIT REGISTER LOCAL TEMPERATURE LOW−LIMIT REGISTER CONVERSION RATE REGISTER ADDRESS POINTER REGISTER PIN ASSIGNMENT Pin No. Mnemonic Description 1 VDD Positive Supply, 3.0 V to 3.6 V. 2 D+ Positive Connection to Remote Temperature Sensor. (Anode) 3 D− Negative Connection to Remote Temperature Sensor. (Cathode) 4 THERM Open-Drain Output. Can be used to turn a fan on/off or throttle a CPU clock in the event of an overtemperature condition. Requires pullup resistor. 5 GND Supply Ground Connection. 6 ALERT / THERM2 Open-Drain Logic Output Used as Interrupt or SMBus ALERT. This can also be configured as a second THERM output. Requires pullup resistor. 7 SDATA Logic Input/Output, SMBus Serial Data. Open-Drain Output. Requires pullup resistor. 8 SCLK Logic Input, SMBus Serial Clock. Requires pullup resistor. |
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