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USB2512I-AEZG Datasheet(PDF) 10 Page - SMSC Corporation |
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USB2512I-AEZG Datasheet(HTML) 10 Page - SMSC Corporation |
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10 / 37 page  Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller Datasheet Revision 1.92 (11-28-07) 10 SMSC USB2512i DATASHEET XTAL2 32 OCLKx Crystal Output 24MHz Crystal This is the other terminal of the crystal, or a NO-CONNECT when an external clock source is used to drive XTAL1/CLKIN. This output must not be used to drive any external circuitry other than the crystal circuit. RESET_N 26 IS RESET Input The system can reset the chip by driving this input low. The minimum active low pulse is 1 us. When the RESET_N pin is pulled to VDD33, the internal POR (Power on Reset) is enabled and no external reset circuitry is required. The internal POR holds the internal logic in reset until the power supplies are stable. SUSP_IND/ LOCAL_PWR/ NON_REM0 28 I/O Active/Suspend status LED or Local-Power & Non Removable Strap Option Suspend Indicator: Indicates USB state of the hub. ‘negated’ = Unconfigured, or configured and in USB Suspend ‘asserted’ = Hub is configured, and is active (i.e., not in suspend) Local Power: Detects availability of local self-power source. Low = Self/local power source is NOT available (i.e., Hub gets all power from Upstream USB VBus). High = Self/local power source is available. NON_REM0 Strap Option: If this strap is enabled by package and configuration settings (see Table 3.2), this pin will be sampled (in conjunction with NON_REM1) at RESET_N negation to determine if ports [2:1] contain permanently attached (non-removable) devices. Also, the active state of the LED will be determined as follows: NON_REM[1:0] = ‘00’, All ports are removable, and the LED is active high NON_REM[1:0] = ‘01’, Port 1 is nonremovable, and the LED is active low NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable, and the LED is active high NON_REM[1:0] = ‘11’, Ports 1 & 2 are non-removable, and the LED is active low TEST 11 IPD TEST pin Used for testing the chip. User must treat as a no-connect or connect to ground. Table 3.2 SMBus or EEPROM Interface Behavior CFG_SEL1 CFG_SEL0 SMBUS OR EEPROM INTERFACE BEHAVIOR 0 0 Internal Default Configuration Strap Options Enabled Table 3.1 USB2512i Pin Descriptions (continued) SYMBOL QFN-36 EMB BUFFER TYPE DESCRIPTION |
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