UCS1002-2 datasheet(32/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1002

DATASHEET

4.2.4.1

Block Write

The Block Write is used to write multiple data bytes to a group of contiguous registers as shown in

Table 4.8.

APPLICATION NOTE: When using the Block Write protocol, the internal address pointer will be automatically

incremented after every data byte is received. It will wrap from FFh to 00h.

4.2.4.2

Block Read

The Block Read is used to read multiple data bytes from a group of contiguous registers as shown in

Table 4.9.

APPLICATION NOTE: When using the Block Read protocol, the internal address pointer will be automatically

incremented after every data byte is received. It will wrap from FFh to 00h.

4.3

Stand-alone Operating Mode

Stand-alone mode allows the UCS1002 to operate without active SMBus / I2C communications. Stand-

alone mode can be enabled by connecting a pull-down resistor greater or equal to 47 k

Ω on the

COMM_SEL / ILIM pin as shown in Table 4.1, "UCS1002 Communication Mode and ILIM Selection".

When the device is configured to operate in Stand-alone mode, the fault handling and Attach Detection

controls are determined via the LATCH and S0 pins as shown in Table 4.10.

APPLICATION NOTE: If it is necessary to connect the S0 or LATCH pins to VDD via a pull-up resistor, the pull-up

resistor value should be 100 k

Ω in order to guarantee VIH specification. Likewise, if it is

necessary to connect the S0 or LATCH pins to GND via a pull-down resistor, the pull-down

resistor value should be 100 k

Ω in order to guarantee VIL specification.

Table 4.8 Block Write Protocol

START

CLIENT

ADDRESS

ACK

ADDRESS

ACK

DATA

ACK

1 ->0

YYYY_YYY

XXh

DATA

ACK

DATA

ACK

. . .

DATA

ACK

STOP

XXh

. . .

XXh

0 -> 1

Table 4.9 Block Read Protocol

START

CLIENT

ADDRESS

ACK

ADDRESS

ACK

START

CLIENT

ADDRESS

ACK

DATA

1->0

YYYY_YYY

XXh

1 ->0

YYYY_YYY

XXh

ACK

DATA

ACK

DATA

ACK

DATA

ACK

. . .

DATA

NACK

STOP

XXh

. . .

XXh

0 -> 1

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