UCS1002-2 datasheet(29/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

4.2.1.3

SMBus Data Bytes

All SMBus data bytes are sent most significant bit first and composed of 8-bits of information.

4.2.1.4

SMBus ACK and NACK Bits

The SMBus client will acknowledge all data bytes that it receives. This is done by the client device

pulling the SMBus data line low after the 8th bit of each byte that is transmitted. This applies to both

the Write Byte and Block Write protocols.

The host will NACK (not acknowledge) the last data byte to be received from the client by holding the

SMBus data line high after the 8th data bit has been sent. For the Block Read protocol, the host will

ACK each data byte that it receives except the last data byte.

4.2.1.5

SMBus Stop Bit

The SMBus Stop bit is defined as a transition of the SMBus data line from a logic ‘0’ state to a logic

‘1’ state while the SMBus clock line is in a logic ‘1’ state. When the UCS1002 detects an SMBus Stop

Table 4.2 SEL Pin Decode

RESISTOR (±5%)

PWR_EN

POLARITY

SMBUS ADDRESS

GND

Active Low

1010_111(r/w)

10 k

Ω pull-down

Active Low

1010_110(r/w)

12 k

Ω pull-down

Active Low

1010_101(r/w)

15 k

Ω pull-down

Active Low

1010_100(r/w)

18 k

Ω pull-down

Active Low

0110_000(r/w)

22 k

Ω pull-down

Active Low

0110_001(r/w)

27 k

Ω pull-down

Active Low

0110_010(r/w)

33 k

Ω pull-down

Active Low

0110_011(r/w)

47 k

Ω pull-down

Active High

0110_011(r/w)

56 k

Ω pull-down

Active High

0110_010(r/w)

68 k

Ω pull-down

Active High

0110_001(r/w)

82 k

Ω pull-down

Active High

0110_000(r/w)

100 k

Ω pull-down

Active High

1010_100(r/w)

120 k

Ω pull-down

Active High

1010_101(r/w)

150 k

Ω pull-down

Active High

1010_110(r/w)

VDD

(If a pull-up resistor is used, its

value must not exceed 100 k

Ω.)

Active High

1010_111(r/w)

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