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KMA221 Fiches technique(PDF) 7 Page - NXP Semiconductors |
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KMA221 Fiches technique(HTML) 7 Page - NXP Semiconductors |
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7 / 36 page  KMA221 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 1 — 16 July 2013 7 of 36 NXP Semiconductors KMA221 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 Broken bond wire detection The broken bond wire detection circuit enables the detection of an interrupted supply or ground line of the MR sensor bridge. If there is a broken bond wire, the device goes into diagnostic mode and a status bit is set. 7.5 Low supply voltage detection and overvoltage protection If the supply voltage is below the switch-off threshold voltage, a status bit is set and the device goes into diagnostic mode. If the supply voltage is above the overvoltage switch-on threshold voltage, the device enters 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 Table 5. System behavior Supply voltage State Description 0V to 1.8 V start-up power The output buffer drives an active LOW or is powered down. 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. |
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