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P9038-RNDGI8 Datasheet(PDF) 11 Page - Integrated Device Technology |
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P9038-RNDGI8 Datasheet(HTML) 11 Page - Integrated Device Technology |
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11 / 18 page  P9038 DATASHEET P9038 August 1, 2016 11 ©2016 Integrated Device Technology, Inc. The P9038 monitors the VBUS_SNS pin for over-voltage conditions and shuts off the OVP MOSFET to implement over-voltage protection. This OVP threshold can be configured via a single pin as shown in Table 6. Table 6: VBUS OVP Threshold Selection A secondary over voltage protection with a 9.5V threshold is implemented on REG_IN for cases where the OVP MOSFET is not used. If the REG_IN threshold is exceeded, the P9038 is disabled until the REG_IN voltage drops below 8V. Demodulation Power transfer from the P9038 to a WPC-compliant wireless power receiver, such as P9025AC-R, is controlled by the receiver. Communication packets are superimposed on the power link between the two devices, and are demodulated by the P9038. Further information about the WPC communication protocol can be found at the WPC website. Communication can be made more robust by running traces from Shield1 and Shield2 along both sides of the HPF trace. Analog-to-Digital Converter [ADC] The ADC is the main functional block which the MCU uses for IC operation, including Foreign Object Detection. The ADC also digitizes several internal and external voltages and currents for overall system control and improved demodulation functionality. USB DP/DM Functionality The P9038 implements USB D+/D- detection derived from the BCS1.2 specification. This determines whether the USB power source is a Standard Port (such as from a computer) or a dedicated USB power supply Charger Port. When a Charger Port is detected, the P9038 will set its GPIO-5 pin to a logic-high state to indicate power is from a Charger Port. This information may be used for any purpose, but has no direct effect on the actual operation of the P9038. Operation of the P9038 follows the commonly accepted practice in wireless charging to draw as much power as the source will allow. A Charger Port will provide its rated output, which is usually greater than the normal 500mA limit that could be typically expected from a Standard Port. Foreign Object Detection and Input Over-current Protection The P9038 makes precision measurements of the input voltage and input current, which are sampled by the internal ADC and processed in firmware for WPC 1.2.2 Foreign Object Detection [FOD] compliance. Two external pins, ISNS_AVG and VSNS_AVG, are provided for filtering the input current sense and input voltage sense signals respectively. The input current sense signal is generated differentially from the ISNSP_IN and ISNSN_IN pins. This input current sense signal is filtered by an internal 50k output resistor combined with an external capacitor on the ISNS_AVG pin. Input voltage measurements are also filtered by an internal 33k output resistor on the VSNS_AVG pin combined with an external capacitor on the VSNS_AVG pin. It is recommended to follow approximately the filter time constants used on the VSNS_AVG and ISNS_AVG signals as shown in the reference design to insure time alignment of the resulting measurements and accurate power calculation for FOD and other purposes. External Chip Reset and EN The P9038 can be externally reset by pulling the RESET pin to a logic high (above the VIH level). The RESET pin is a dedicated high-impedance active-high digital input, and its effect is similar to the automatic power-up reset function. Because of the internal low voltage monitoring/ reset scheme, the use of the external RESET pin is not mandatory. When RESET is HIGH, the micro-controller's registers are set to the default configuration. When the RESET pin is released to a LOW, the micro-controller starts loading and executing the firmware from the program memory. If the particular application requires the P9038 to be disabled, this can be accomplished with the EN pin. When the EN pin is pulled high, the device is shuts off and placed in a very low current condition.When EN is connected to logic LOW, the device will become active, and the micro-controller starts loading and executing the firmware from the program memory. The current into EN is approximately equal to: or close to zero if V(EN) is less than 2V. OVP_SEL Pin Connection OVP threshold 220kΩ to ground 6.3V Grounded 7.15V Floating 7.85V I EN V EN 2 – 300K ------------------- = |
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