REVISION 08/26/15
9
P9025AC FOD TUNING GUIDE
AN-886
be filled in)
Page 1: ...on the pre programmed FOD curve For WPC compliant systems the loss allowed due to foreign objects is 350 mW not including known losses due to the Tx and Rx systems For systems where WPC compliance is...
Page 2: ...sfer and decode communication packets Respectively the Rx device measures the power that it is receiving i e delivering to the load and reports that value to the Tx module Since the Rx circuit and sys...
Page 3: ...for exact values The Rx Reported Received Power vs Load Current graph is an indication of the power lost due to the electrical operations required for the Tx and Rx to function as the load current cha...
Page 4: ...WER_FOD reported level This offset is applied by connecting an external resistor from pin FOD2 to GND and directly affects the received power level that is reported to the transmitter across the load...
Page 5: ...At 0 9V the offset is 0 mW At 0 V the offset is 300mW and at 1 8V the offset is 300mW The Rx reported received power shift can be calculated using the following equation where VFOD2 is found using equ...
Page 6: ...power value from the Rx Second the FOD1 pin on the P9025AC Rx should be connected to GND This will have the effect of selecting the pre programmed Bank 10 which maxes out the reported power level If...
Page 7: ...left hand input table labeled First data set 7 Move the Rx coil exactly 5mm away from the Optimal Alignment Location in any direction that is 90 Clock wise or counter clockwise from the direction chos...
Page 8: ...the recommended bank by highlighting the suggested FOD1 and FOD2 resistances to use under the Bank row The listed values in the FOD1 section are the largest reported power error contained within the...
Page 9: ...REVISION 08 26 15 9 P9025AC FOD TUNING GUIDE AN 886 be filled in...
Page 10: ...100 MDT BST Reference Testers should be used in conjunction with calibrated lab equipment These laboratories offer excellent Qi compliance FOD determination services and they are recommended Due to th...
Page 11: ...license under intellectual property rights of IDT or any third parties IDT s products are not intended for use in applications involving extreme environmental conditions or in life support systems or...
