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SPEAR320 数据表(PDF) 26 Page - STMicroelectronics |
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SPEAR320 数据表(HTML) 26 Page - STMicroelectronics |
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26 / 73 page ![]() Pin description SPEAr320 26/73 Doc ID 16755 Rev 5 4 Pin description The following tables describe the pinout of the SPEAr320 listed by functional block. List of abbreviations: PU = Pull Up PD = Pull Down 4.1 Required external components 1. DDR_COMP_1V8: place an external 121 k Ω resistor between ball P4 and ball R4 2. USB_TX_RTUNE: connect an external 43.2 Ω pull-down resistor to ball K5 3. DIGITAL_REXT: place an external 121 k Ω resistor between ball G4 and ball F4 4. DITH_VDD_2V5: Add a ferrite bead to ball M4 4.2 Dedicated pins Table 3. Master clock, RTC, Reset and 3.3 V comparator pin descriptions Group Signal name Ball Direction Function Pin type Master Clock MCLK_XI P1 In 24 MHz (typical) crystal in Oscillator 2.5 V capable MCLK_XO P2 Out 24 MHz (typical) crystal out RTC RTC_XI E2 In 32 kHz crystal in Oscillator 1V5 capable RTC_XO E1 Out 32 kHz crystal out Reset MRESET M17 In Main Reset TTL Schmitt trigger input buffer, 3.3 V tolerant 3.3 V Comp. DIGITAL_REXT G4 Out Configuration Analog, 3.3 V capable DIGITAL_GNDBG COMP F4 Power Power Power Table 4. Power supply pin description Group Signal name Ball Value DIGITAL GROUND GND G6 G7 G8 G9 G10 G11 H6 H7 H8 H9 H10 H11 J6 J7 J8 J9 J10 J11 K6 K7 K8 K9 K10 K11 L6 L7 L8 L9 L10 M8 M9 M10 0 V USB_HOST1_HOST0_DEVICE_DVSS L5 |
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