USB2512 SMSC Corporation, USB2512 Datasheet - Page 10

• Manufacturer Part Number: USB2512
• Description: USB 2.0 High-Speed 2-Port Hub Controller
• Manufacturer: SMSC Corporation

USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
SMSC USB2512
CFG_SEL1
LOCAL_PWR/
NON_REM0
SUSP_IND/
RESET_N
SYMBOL
XTAL2
TEST
0
CFG_SEL0
QFN-36
EMB
32
26
28
11
0
Table 3.1 USB2512 Pin Descriptions (continued)
Table 3.2 SMBus or EEPROM Interface Behavior
BUFFER
OCLKx
Internal Default Configuration
TYPE
IPD
I/O
IS
Strap Options Enabled
DATASHEET
Crystal Output
RESET Input
Active/Suspend status LED or Local-Power & Non Removable
TEST pin
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.
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.
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
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
Used for testing the chip. User must treat as a no-connect or
connect to ground.
SMBUS OR EEPROM INTERFACE BEHAVIOR
Table
10
3.2), this pin will be sampled (in conjunction with
DESCRIPTION
Revision 1.92 (11-28-07)