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KMA220 Folha de dados(PDF) 7 Page - NXP Semiconductors |
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KMA220 Folha de dados(HTML) 7 Page - NXP Semiconductors |
7 / 36 page KMA220 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 1 — 24 May 2012 7 of 36 NXP Semiconductors KMA220 Dual channel programmable angle sensor Table 4 describes the power-loss behavior and gives the resulting output voltage depending on the interrupted supply or ground line and the load resistance. 7.4 Low supply voltage detection and overvoltage protection If the supply voltage is below the switch-off threshold voltage, a status bit is set in each signal conditioning integrated circuit and both channels go into diagnostic mode. If the supply voltage is above the overvoltage switch-on threshold voltage, both channel enter diagnostic mode. Table 5 describes the system behavior depending on the voltage range of the supply voltage. Fig 4. Equivalent output circuit in a power-loss condition Table 4. Power-loss behavior Load resistance Interrupted supply line Interrupted ground line RL(ext) >5k VO 4%VDD VO 96 %VDD 008aaa277 ZO(pl) ZO(pl) OUTn/DATAn GND VDD OUTPUT Table 5. System behavior for each output Supply voltage State Description 0V to 1.8 V start-up power The output buffer drives an active LOW or is powered down, but the switches of the power-loss detection circuit are not fully opened and set the output to a level between ground and half the supply voltage. 1.8 V to V POR power-on reset The power-loss charge pump is fully operational and turns the switches of the detection circuit off. The output buffer drives an active LOW and sets the output to the lower diagnostic level. During the reset phase, all circuits are in reset and/or Power-down mode. VPOR to Vth(on) or Vth(off) initialization The digital core and the oscillator are active. After reset, the content of the non-volatile memory is copied into the shadow registers. The output buffer drives an active LOW and sets the output to the lower diagnostic level. Vth(on) or Vth(off) to minimum VDD functional operation All analog circuits are active and the measured angle is available at the analog output. Not all parameters are within the specified limits. Minimum VDD to maximum VDD normal operation All analog circuits are active and the measured angle is available at the analog output. All parameters are within the specified limits. Maximum VDD to Vth(ov) functional operation All analog circuits are active and the measured angle is available at the analog output. Not all parameters are within the specified limits. Vth(ov) to 16 V overvoltage Both digital cores and oscillators are active but all other circuits are in Power-down mode. The outputs are set to the lower diagnostic level. |
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