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33810 データシート(PDF) 21 Page - Freescale Semiconductor, Inc |
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33810 データシート(HTML) 21 Page - Freescale Semiconductor, Inc |
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21 / 35 page  Table 11. Nominal Current DAC Select DAC Command Bits<4,3,2,1,0> NOMI Current (A) Differential Voltage (mV Rs = 20 m Ω (Gain = 2) Differential Voltage (mV Rs = 40 m Ω (Gain = 1) 00000 3.00 60 120 00001 3.25 65 130 00010 3.50 70 140 00011 3.75 75 150 00100 4.00 80 160 00101 4.25 85 170 00110 4.50 90 180 00111 4.75 95 190 01000 5.00 100 200 01001 5.25 105 210 01010 5.50 110 220 01011 5.75 115 230 01100 6.00 120 240 01101 6.25 125 250 01110 6.50 130 260 01111 6.75 135 270 10000 7.00 140 280 10001 7.25 145 290 10010 7.50 150 300 10011 7.75 155 310 10100 8.00 160 320 10101 8.25 165 330 10110 8.50 170 340 10111 8.75 175 350 11000 9.00 180 360 11001 9.25 185 370 11010 9.50 190 380 11011 9.75 195 390 11100 10.00 200 400 11101 10.25 205 410 11110 10.50 210 420 11111 10.75 215 430 Analog Integrated Circuit Device Data Freescale Semiconductor 21 33810 FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES MAXI DAC BITS The MAXI control block provides a means to shut off all the ignition coil drivers if the current reaches a SPI programmable maximum level. Control is achieved by comparing the output of the current sense amplifier with a SPI programmed DAC value. The MAXI comparator disables all gate drivers configured as ignition drivers when the DAC MAXI setting is exceeded. When a MAXI event occurs, the MAXI bit in the fault status register is set and the MAXI pin is asserted (High). When using a 20 mΩ resistor as the current sense resistor, the gain select of the differential amplifier connected to RSP and RSN, should be set to a gain of 2, via the SPI Command Message Spark Command (Command 0100, hex 4), Control bit 6 =1. When using a 40 mΩ resistor as the current sense resistor, the gain select of the differential amplifier connected to RSP and RSN, should be set to a gain of 1, via the SPI Command Message Spark Command (Command 0100, hex 4), Control bit 6 =0. This is also the default value. The MAXI fault bit in the SPI fault status register is cleared when the MAXI condition no longer exists and the SPI fault status register has been read by the MCU. In V10 Mode, the MAXI pin is configured as an input to receive the MAXI signal from a second MC33810 device in the system. In this mode a input MAXI signal has effectively the same control as an internal MAXI signal. Further information is provided in the V10 Mode application section of this specification. Table 11. Nominal Current DAC Select DAC Command Bits<4,3,2,1,0> NOMI Current (A) Differential Voltage (mV Rs = 20 m Ω (Gain = 2) Differential Voltage (mV Rs = 40 m Ω (Gain = 1) |
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