Industrial Temperature Rated USB 2.0
Datasheet
Table 3.1 USB2512Ai Pin Descriptions (continued)
| BUFFER |
| |
SYMBOL | EMB | TYPE | DESCRIPTION |
|
|
|
|
RBIAS | 35 | USB Transceiver Bias | |
|
|
| A 12.0kΩ (+/- 1%) resistor is attached from ground to this pin |
|
|
| to set the transceiver’s internal bias settings. |
|
|
|
|
|
| SERIAL PORT INTERFACE | |
|
|
|
|
SDA/ | 22 | I/OSD12 | Serial Data / SMB Data & Port |
SMBDATA/ |
|
| NON_REM1: |
NON_REM1 |
|
| |
|
|
| If this strap is enabled by package and configuration settings |
|
|
| (see Table 3.2, "SMBus or EEPROM Interface Behavior"), this |
|
|
| pin will be sampled (in conjunction with LOCAL_PWR/ |
|
|
| SUSP_IND/NON_REM0) at RESET_N negation to determine if |
|
|
| ports [2:1] contain permanently attached |
|
|
| devices: |
|
|
| NON_REM[1:0] = ‘00’, All ports are removable. |
|
|
| NON_REM[1:0] = ‘01’, Port 1 is |
|
|
| NON_REM[1:0] = ‘10’, Ports 1 & 2 are |
|
|
| NON_REM[1:0] = ‘11’, Ports 1 & 2 are |
|
|
|
|
SCL/ | 24 | I/OSD12 | Serial Clock (SCL) |
|
|
|
|
SMBCLK/ |
|
| SMBus Clock (SMBCLK) |
|
|
|
|
CFG_SEL0 |
|
| Configuration Select_SEL0: The logic state of this multifunction |
|
|
| pin is internally latched on the rising edge of RESET_N |
|
|
| (RESET_N negation), and will determine the Hub configuration |
|
|
| method as described in Table 3.2, "SMBus or EEPROM |
|
|
| |
|
|
|
|
HS_IND/ | 25 | I/O12 | |
CFG_SEL1 |
|
| Programming Select |
|
|
| HS_IND: |
|
|
| speed. |
|
|
| The active state of the LED will be determined as follows: |
|
|
| CFG_SEL1 = ‘0’, |
|
|
| HS_IND is active high, |
|
|
| CFG_SEL1 = ‘1’, |
|
|
| HS_IND is active low, |
|
|
| ‘Asserted’ = Hub is connected at HS |
|
|
| ‘Negated’ = Hub is connected at FS |
|
|
|
|
|
|
| CFG_SEL1: The logic state of this pin is internally latched on |
|
|
| the rising edge of RESET_N (RESET_N negation), and will |
|
|
| determine the Hub configuration method as described in |
|
|
| |
|
|
|
|
|
|
| MISC |
|
|
|
|
XTAL1/ | 33 | ICLKx | Crystal Input/External Clock Input |
CLKIN |
|
| 24MHz crystal or external clock input. |
|
|
| |
|
|
| This pin connects to either one terminal of the crystal or to an |
|
|
| external 24MHz clock when a crystal is not used. |
|
|
|
|
SMSC USB2512Ai | 9 | Revision 1.97 |
| DATASHEET |
|