PCA9545AD,112 NXP Semiconductors, PCA9545AD,112 Datasheet - Page 10

• Manufacturer Part Number: PCA9545AD,112
• Description: IC I2C SWITCH 4CH 20SOIC
• Manufacturer: NXP Semiconductors

Specifications of PCA9545AD,112

• Applications: 4-Channel I²C Switcher
• Interface: I²C
• Voltage - Supply: 2.3 V ~ 3.6 V, 4.5 V ~ 5.5 V
• Package / Case: 20-SOIC (7.5mm Width)
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935275808112; PCA9545AD; PCA9545AD

NXP Semiconductors
7. Characteristics of the I
PCA9545A_45B_45C_7
Product data sheet
7.1 Bit transfer
7.2 START and STOP conditions
The I
lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be
connected to a positive supply via a pull-up resistor when connected to the output stages
of a device. Data transfer may be initiated only when the bus is not busy.
One data bit is transferred during each clock pulse. The data on the SDA line must remain
stable during the HIGH period of the clock pulse as changes in the data line at this time
will be interpreted as control signals (see
Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW
transition of the data line, while the clock is HIGH is defined as the START condition (S).
A LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the
STOP condition (P) (see
Fig 10. Bit transfer
Fig 11. Definition of START and STOP conditions
2
C-bus is for 2-way, 2-line communication between different ICs or modules. The two
SDA
SCL
START condition
2
SDA
SCL
C-bus
S
Rev. 07 — 19 June 2009
Figure
4-channel I
11).
data valid
data line
stable;
Figure
2
C-bus switch with interrupt logic and reset
allowed
change
of data
PCA9545A/45B/45C
10).
STOP condition
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P
© NXP B.V. 2009. All rights reserved.
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