PCA9517 Datasheet, PDF (10/17 Pages) NXP Semiconductors – Level translating I2C-bus repeater

PCA9517
LEVEL-TRANSLATING I²C BUS REPEATER
SCPS157A – DECEMBER 2007 – REVISED FEBRUARY 2008
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V
CCA
V
CCB
SDA
SCL
BUS
MASTER
10 kΩ
10 kΩ
10 kΩ
SDAA _SDAB
SCLA _SCLB
PCA9517
EN
10 kΩ
SDA
SCL
SLAVE
400 kHz
10 kΩ
SDAA _SDAB
SCLA _SCLB
PCA9517
EN
10 kΩ
SDA
SCL
SLAVE
400 kHz
10 kΩ
10 kΩ
SDAA _SDAB
SDA
SCLA SCLB
PCA9517
EN
SCL
SLAVE
400 kHz
Figure 6. Typical Star Application
Multiple PCA9517 A sides can be connected in a star configuration, allowing all nodes to communicate with each
other.
V
CCB
10 kΩ
SDA
SCL
BUS
MASTER
10 kΩ
10 kΩ
SDAA SDAB
SCLA SCLB
PCA9517
EN
10 kΩ
10 kΩ
SDAA SDAB
SCLA SCLB
PCA9517
EN
10 kΩ
10 kΩ
SDAA SDAB
SCLA ^SCLB
PCA9517
EN
10 kΩ
SDA
SCL
SLAVE
400 kHz
Figure 7. Typical Series Application
Multiple PCA9517s can be connected in series as long as the A side is connected to the B side. I²C bus slave
devices can be connected to any of the bus segments. The number of devices that can be connected in series is
limited by repeater delay/time-of-flight considerations on the maximum bus speed requirements.
10
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