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ISL25700FRUZ-TK Arkusz danych(PDF) 11 Page - Intersil Corporation |
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ISL25700FRUZ-TK Arkusz danych(HTML) 11 Page - Intersil Corporation |
11 / 18 page ISL25700 11 FN6885.0 September 3, 2010 Device ID Register (Reg.00h) This is a read only register. It contains device ID code 00h. Coarse Temperature Control (Reg.01h [2:0]) These 3 bits allow one to choose one of the seven coarse windows for the temperature set point. The default set point is about +59°C for the 100k RTH thermistor with a temperature coefficient of -4.25%/°C at +25°C, i.e. Reg.01h[2:0] = 011b. The temperature set point can be changed to any other set point within an operational range from +40°C to +110°C, or use another type of thermistor, including different resistance value or R/T curve type (NTC slope), and then center the +15°C coarse range temperature window on that new setting based on the ratio of RINT/RTH according to Equation 1: where: RINT - is an internal 9kΩ resistor, forming another leg of the Wheatstone Bridge; K1, K2 and K3 - are coefficients representing the ratio of the current flowing through the legs of the Wheatstone Bridge; Code - is the decimal code in the Fine Temperature Control register 02h. The value of internal resistor RINT can vary from part to part and depends on the package temperature. The actual RINT at temperature T can be calculated using Equation 2: where: RINT(25) = 9000 + RINT abs. error x 15 - is internal resistor value at +25°C in Ohms; RINT abs. error - is a signed integer value of absolute error stored in Reg.07h[7:0] converted to a decimal number; bit [7] represents a sign bit, 0 for “+” and 1 for “-”; - 1st order temperature coefficient, ppm/°C; - 2nd order temperature coefficient, ppm/°C2; T - temperature in Celsius. The K1, K2 and K3 coefficients and the thermistor value range for each Coarse Temperature setting in Reg.01h[2:0] should be taken according to Table 2. Current Sense Threshold (Reg.01h [7:3]) This register sets the current limit trip point. When the voltage applied to the ISENSE pin falls below the programmed voltage threshold, VOUT goes high, thus forming a negative feedback loop proportional to ISENSE x RSENSE. The value for this register should be taken according to Table 3. TABLE 1. ISL25700 MEMORY MAP REGISTER NAME REGISTER ADDRESS BIT MAP DEFAULT SETTINGS 7 6543210 Device ID (Read Only) 00h ID[7] ID[6] ID[5] ID[4] ID[3] ID[2] ID[1] ID[0] 00h Current Sense/ Coarse Temperature Control 01h CS[4] CS[3] CS[2] CS[1] CS[0] CTC[2] CTC[1] CTC[0] 03h Fine Temperature Control 02h FTC[7] FTC[6] FTC[5] FTC[4] FTC[3] FTC[2] FTC[1] FTC[0] 80h Gain Control (DAC Enable/ DAC Gain/System Loop Gain) 03h DAC Enable DAC Gain NA SLG[4] SLG[3] SLG[2] SLG[1] SLG[0] 90h General Purpose DAC 04h DAC[7] DAC[6] DAC[5] DAC[4] DAC[3] DAC[2] DAC[1] DAC[0] 80h General Purpose Register 1 05h GP1[7] GP1[6] GP1[5] GP1[4] GP1[3] GP1[2] GP1[1] GP1[0] 00h General Purpose Register 2 06h GP2[7] GP2[6] GP2[5] GP2[4] GP2[3] GP2[2] GP2[1] GP2[0] 00h RINT Absolute Error (Read Only) 07h sign bit ERR[6] ERR[5] ERR[4] ERR[3] ERR[2] ERR[1] ERR[0] XX Control/Status Register (Volatile Only) 08h NV NA NA NA NA NA NA BUSY 00h RINT T () RTH setpoint () ----------------------------------------- K2 K3 Code 255 --------------- × + K1 -------------------------------------------- = (EQ. 1) RINT T () RINT 25 ()x1 α T25 – () β T25 – ()2 ++ [] = (EQ. 2) TABLE 2. COARSE TEMPERATURE RANGE Register 01h[2:0] K1 K2 K3 THERMISTOR RESISTANCE RANGE AT SET POINT (kΩ) 000 Do not use 001 3 3 2 5.4 to 9.0 010 4 3 2 7.2 to 12.0 100 5 3 2 9.0 to 15.0 011 7 3 2 12.6 to 21.0 101 8 3 2 14.4 to 24.0 110 9 3 2 16.2 to 27.0 111 12 3 2 21.6 to 36.0 α 1337 6 – ×10 – = β 5 6 – ×10 = |
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