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PCA9632DP1 Datasheet(PDF) 6 Page - NXP Semiconductors |
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PCA9632DP1 Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 38 page  PCA9632_3 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 03 — 15 July 2008 6 of 38 NXP Semiconductors PCA9632 4-bit Fm+ I2C-bus low power LED driver [1] HVSON10 package die supply ground is connected to both the VSS pin and the exposed center pad. The VSS pin must be connected to supply ground for proper device operation. For enhanced thermal, electrical, and board-level performance, the exposed pad needs to be soldered to the board using a corresponding thermal pad on the board, and for proper heat conduction through the board thermal vias need to be incorporated in the PCB in the thermal pad region. 7. Functional description Refer to Figure 1 “Block diagram of PCA9632”. 7.1 Device addresses Following a START condition, the bus master must output the address of the slave it is accessing. There are a maximum of 4 possible programmable addresses using the 2 hardware address pins for the 10-pin version and just one fixed address for the 8-pin version. 7.1.1 Regular I2C-bus slave address The I2C-bus slave address of the PCA9632 is shown in Figure 6. To conserve power, no internal pull-up resistors are incorporated on the hardware selectable address pins and they must be pulled HIGH or LOW (10-pin versions only). Remark: Using reserved I2C-bus addresses will interfere with other devices, but only if the devices are on the bus and/or the bus will be open to other I2C-bus systems at some later date. In a closed system where the designer controls the address assignment these addresses can be used since the PCA9632 treats them like any other address. The LED All Call, Software Reset and PCA9564 or PCA9665 slave address (if on the bus) can never be used for individual device addresses. • PCA9632 LED All Call address (1110 000) or Software Reset (0000 0110) which are active on start-up • PCA9564 (0000 000) or PCA9665 (1110 000) slave address which is active on start-up • ‘reserved for future use’ I2C-bus addresses (0000 011, 1111 1XX) • slave devices that use the 10-bit addressing scheme (1111 0XX) Table 3. Pin description for TSSOP10 and HVSON10 Symbol Pin Type Description LED0 1 O LED driver 0 LED1 2 O LED driver 1 LED2 3 O LED driver 2 LED3 4 O LED driver 3 A0 5 I address input 0 VSS 6[1] power supply supply ground A1 7 I address input 1 SCL 8 I serial clock line SDA 9 I/O serial data line VDD 10 power supply supply voltage |
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