MCP23017 查看數據表（PDF） - Microchip Technology

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MCP23017

16-Bit I/O Expander with Serial Interface

Microchip Technology 

MCP23017/MCP23S17

FIGURE 1-3:

I2C BUS START/STOP BITS TIMING

SCL

SDA

91

90

93

92

Start

Condition

Stop

Condition

FIGURE 1-4:

SCL

SDA

In

SDA

Out

I2C BUS DATA TIMING

103

100

101

90

91

106

107

109

109

102

92

110

TABLE 1-3: I2C BUS DATA REQUIREMENTS

I2C Interface AC Characteristics: Unless otherwise noted, 1.8V VDD  5.5V at -40C  TA  +125C, RPU (SCL,

SDA) = 1 k, CL (SCL, SDA) = 135 pF

Param.

No.

Characteristic

Sym.

Min.

Typ. Max. Units

Conditions

100 Clock High Time:

100 kHz mode

THIGH

4.0

— — µs 1.8V – 5.5V

400 kHz mode

0.6

— — µs 2.7V – 5.5V

1.7 MHz mode

0.12

— — µs 4.5V – 5.5V

101 Clock Low Time:

100 kHz mode

TLOW

4.7

— — µs 1.8V – 5.5V

400 kHz mode

1.3

— — µs 2.7V – 5.5V

1.7 MHz mode

102 SDA and SCL Rise Time:

100 kHz mode

400 kHz mode

1.7 MHz mode

103 SDA and SCL Fall Time:

100 kHz mode

400 kHz mode

1.7 MHz mode

TR (1)

TF (1)

0.32

— — µs 4.5V – 5.5V

—

— 1000 ns 1.8V – 5.5V

20 + 0.1 CB (2) — 300 ns 2.7V – 5.5V

20

— 160 ns 4.5V – 5.5V

—

— 300 ns 1.8V – 5.5V

20 + 0.1 CB (2) — 300 ns 2.7V – 5.5V

20

— 80 ns 4.5V – 5.5V

Note 1: This parameter is characterized, not 100% tested.

2: CB is specified to be from 10 to 400 pF.

DS20001952C-page 6

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