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PCA9509DP Datasheet(PDF) 3 Page - NXP Semiconductors |
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PCA9509DP Datasheet(HTML) 3 Page - NXP Semiconductors |
3 / 16 page PCA9509_1 © Koninklijke Philips Electronics N.V. 2006. All rights reserved. Product data sheet Rev. 01 — 27 June 2006 3 of 16 Philips Semiconductors PCA9509 Level translating I2C-bus/SMBus repeater 5. Pinning information 5.1 Pinning 5.2 Pin description [1] Port A and port B can be used for either SCL or SDA. 6. Functional description Refer to Figure 1 “Functional diagram of PCA9509”. The PCA9509 enables I2C-bus or SMBus translation down to VCC(A) as low as 1.0 V without degradation of system performance. The PCA9509 contains 2 bidirectional open-drain buffers specifically designed to support up-translation/down-translation between the low voltage and 3.3 V SMBus or 5 V I2C-bus. The port B I/Os are over-voltage tolerant to 5.5 V even when the device is unpowered. The PCA9509 includes a power-up circuit that keeps the output drivers turned off until VCC(B) is above 2.5 V and the VCC(A) is above 0.8 V. VCC(B) and VCC(A) can be applied in any sequence at power-up. After power-up and with the EN pin HIGH, a LOW level on port A (below approximately 0.15 V) turns the corresponding port B driver (either SDA or SCL) on and drives port B down to about 0 V. When port A rises above approximately 0.15 V, the port B pull-down driver is turned off and the external pull-up resistor pulls the pin HIGH. When port B falls first and goes below 0.3VCC(B), the port A driver is turned on and port A pulls down to 0.2 V (typical). The port B pull-down is not enabled unless the port A voltage goes below VILc. If the port A low voltage goes below VILc, the port B Fig 2. Pin configuration for TSSOP8 Fig 3. Pin configuration for SO8 PCA9509DP VCC(A) VCC(B) A1 B1 A2 B2 GND EN 002aac126 1 2 3 4 6 5 8 7 PCA9509D VCC(A) VCC(B) A1 B1 A2 B2 GND EN 002aac127 1 2 3 4 6 5 8 7 Table 2. Pin description Symbol Pin Description VCC(A) 1 port A power supply A1[1] 2 port A (lower voltage side) A2[1] 3 port A GND 4 ground (0 V) EN 5 enable input (active HIGH) B2[1] 6 port B (SMBus/I2C-bus side) B1[1] 7 port B VCC(B) 8 port B power supply |
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