USB3813 datasheet(35/68 Pages) SMSC

35 / 68 page

USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications

Datasheet

SMSC USB3813

Revision 1.0 (06-17-13)

DATASHEET

7.2.2

Pull-Up Resistors for I2C

The circuit board designer is required to place external pull-up resistors (10 k

Ω recommended) on the

SDA & SCL signals (per SMBus 1.0 Specification) to Vcc in order to assure proper operation.

7.3

SMBus Slave Interface

The USB3813 includes an integrated SMBus slave interface, which can be used to access internal

device run time registers or program the internal OTP memory. SMBus detection is accomplished by

detection of pull-up resistors (10 K

Ω recommended) on both the SMBDATA and SMBCLK signals. To

disable the SMBus, a pull-down resistor of 10 K

Ω must be applied to SMBDATA. The SMBus interface

can be used to configure the device as detailed in Section 6.1, "Configuration Method Selection," on

page 24.

Note: All device configuration must be performed via the SMSC Pro-Touch Programming Tool. For

additional information on the Pro-Touch programming tool, contact your local SMSC sales

representative.

7.3.1

SMBus Run Time Accessible Registers

Table 7.1 provides a summary of the SMBus accessible run time registers. Each register is detailed in

the subsequent tables.

Note: The SMBus page register must be configured to allow the SOC to access the proper register

space. Refer to Section 7.3.2, "Run Time SMBus Page Register," on page 48 for details.

Table 7.1 SMBus Accessible Run Time Registers

NAME

XDATA

ADDR

UP_BC_DET

0x30E2

Table 7.2, "Upstream Battery Charging Detection Control Register"

UP_CUST_BC_CTL

0x30E3

Table 7.3, "Upstream Custom Battery Charger Control Register"

UP_CUST_BC_STAT

0x30E4

Table 7.4, "Upstream Custom Battery Charger Status Register"

PORT_PWR_STAT

0x30E5

Table 7.5, "Port Power Status Register"

OCS_STAT

0x30E6

Table 7.6, "OCS Status Register"

INT_STATUS

0x30E8

Table 7.7, "Serial Port Interrupt Status Register"

INT_MASK

0x30E9

Table 7.8, "Serial Port Interrupt Mask Register"

BC_CHG_MODE

0x30EC

Table 7.9, "Upstream Battery Charger Mode Register"

CHG_DET_MSK

0x30ED

Table 7.10, "Charge Detect Mask Register"

CFGP

0x30EE

Table 7.11, "Configure Portable Hub Register"

PSELSUSP

0x318B

Table 7.12, "Port Select and Low-Power Suspend Register"

CONNECT_CFG

0x318E

Table 7.13, "Connect Configuration Register"

BC_CTL_1 (Upstream)

0x6100

Table 7.14, "Upstream (Port 0) Battery Charging Control 1 Register"

BC_CTL_2

(Upstream)

0x6101

Table 7.15, "Upstream (Port 0) Battery Charging Control 2 Register"

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