NXP Semiconductors Freescale MCIMX53SMD Hardware User's Manual

Distributor of NXP Semiconductors: Excellent Integrated System LimitedDatasheet of MCIMX53SMD - TABLET SABRE PLATFORM MCIMX53Contact us: sales@integrated-circuit.com Website: www.integrated-circuit.comFreescale Semiconductor MCIMX53SMD Board Hardware User’s Guide, Rev. 0 45The i.MX53 processor has an internal method and an external method to measure Band Gap resistance. If theinternal method is chosen by the software, pin AA14 can be left floating. If the external method is desired, a28.0K 1%Ω resistor should be attached between pin AA14 and ground. It is recommended to add this resistorroutinely to give software the option of choosing between the two methods. It is also recommended to placea 49.9 1%Ω resistor as the voltage input pin of U14 (NVCC_LVDS_BG) to filter the power used in measuring theBand Gap resistance.5.10. Expansion PortThe function of the MCIMX53SMD board Expansion Port is to bring out many of the i.MX53 pins that areotherwise unused on the MCIMX53SMD board. The overriding design considerations for this port were to beable to support HDMI functionality through a daughter card (primary), while also being able to support anexisting LCD daughter card (secondary). In meeting these considerations, the Expansion Port was alsoconstrained to meet a general power/signal format adopted across all recent i.MX development boarddesigns, primarily for safety and equipment damage consideration. For these reasons, there may be somefunctionalities of the i.MX53 chip that are not accessible on the MCIMX53SMD board.For developers who are interested in designing custom daughter cards to be used with the MCIMX53SMDboard, the following capabilities are available from the Expansion Port. Note that many pins are muxed, sothat not all features are available at the same time:Two Serial Peripheral Interfaces (SPI) CSPI, eCSDPI2Two I2S/SSI/AC97 Ports AUDMUX4, AUDMUX5Two Inter-Integrated Circuits (I2C) I2C1, I2C22 UARTs UART4, UART5SPDIF AudioUSB ULPI Port USBH224-bit Data and display control signalsResistive Touch Screen InterfaceIn addition to the Data/Signal traces to support the above functionality, the following power sources are alsoincluded on the Expansion Port:5V_MAIN 5V DCDC_5VLCD_3V3 3.3V DCDC_3V3VIOHI_2V775 2.775V VLDO4VLDO8_1V8 1.8V VLDO8VLDO9_1V5 1.5V VLDO9VLCD_BLT Current Source PMIC LED DriverNote that VLDO9 is only used by the Expansion Port on the MCIMX53SMD board. The developer is free toreprogram the LDO regulator on the PMIC for desired voltage with these limitations:Voltage 1.25V – 3.6VCurrent 100 mAA suitable connector to be used with Expansion Port J13 is one developed by Samtec, QTH-060-XX-L-D-A,where XX determines the height of the connector. See the Connector Pin-Outs section to know about theavailable pin-mux options.5.11. AudioThe main Audio CODEC used on the MCIMX53SMD board is the Freescale SGTL5000 Low Power Stereo Codecwith Headphone Amp. The i.MX53 processor provides digital sound information from the AUDMUX module