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DS1857E-050 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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DS1857E-050 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 22 page Dual Temperature-Controlled Resistors with External Temperature Input and Monitors _____________________________________________________________________ 7 Detailed Description The user can read the registers that monitor the VCC, MON1, MON2, and temperature analog signals. After each signal conversion, a corresponding bit is set that can be monitored to verify that a conversion has occurred. The signals also have alarm flags that notify the user when the signals go above or below the user- defined value. Interrupts can also be set for each signal. The position values of each resistor can be indepen- dently programmed. The user can assign a unique value to each resistor for every 2°C increment over the -40°C to +102°C range. Both resistors can also be put in a high-impedance mode using the RHIZ pin. An external temperature sense input, EXTTMP, con- verts an analog voltage into a digital value that repre- sents temperature. Its scale is defined by +10mV/°C gain and +500mV offset at 0°C. This corresponds to the characteristics of the LM50 temperature sensor. The resistor look-up tables are stepped through according to this temperature every 2°C from -40°C to +102°C. PIN BALL NAME FUNCTION 1B2 SDA 2-Wire Serial Data Interface. This pin is for serial data transfer to and from the device. 2A2 SCL 2-Wire Serial Clock Interface. The serial clock input is used to clock data into and out of the device. 3C3A0 Address Input. The address input pins specify the 2-wire address of the device (when ADFIX = 0). 4A1A1 Address Input. The address input pins specify the 2-wire address of the device (when ADFIX = 0). 5B1A2 Address Input. The address input pins specify the 2-wire address of the device (when ADFIX = 0). 6C2 WPEN Write Protect Enable. The device is not write protected if WPEN is connected to ground. This pin has an internal pullup (RWPEN) (See Table 6). 7C1 RHIZ Resistor Disable Input. When high, this signal places both resistors in an off state or high impedance mode. When low, the resistors are on. This pin has an internal pullup (RRHIZ). 8D1 GND Supply Ground 9D3 MON1 External Analog Input 10 D4 MON2 External Analog Input 11 C4 EXTTMP External Temperature Input. This analog signal is converted into a digital value that represents a temperature. The digitized value indexes through the look-up tables. 12 D2 L0 Low-End Resistor 0 Terminal. It is not required that the low-end terminals be connected to a potential less than the high-end terminal of the corresponding resistor. Voltage applied to any of the resistor terminals cannot exceed the power-supply voltage, VCC, or go below ground. 13 B3 H0 High-End Resistor 0 Terminal. It is not required that the high-end terminals be connected to a potential greater than the low-end terminal of the corresponding resistor. Voltage applied to any of the resistor terminals cannot exceed the power-supply voltage, VCC, or go below ground. 14 B4 L1 Low-End Resistor 1 Terminal 15 A4 H1 High-End Resistor 1 Terminal. 16 A3 VCC Supply Voltage Pin Descriptions |
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Similar Description - DS1857E-050 |
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