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PCA9922PW Datasheet(PDF) 5 Page - NXP Semiconductors |
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PCA9922PW Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 26 page PCA9922_1 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 01 — 15 January 2009 5 of 26 NXP Semiconductors PCA9922 8-channel constant current LED driver with output error detection 6.2 Pin description [1] HVQFN20 package die supply ground is connected to both VSS pin and exposed center pad. 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. Table 3. Pin description I = input; O = output. Symbol Pin Type Description DIP16, TSSOP16 HVQFN20 VSS 119[1] power supply supply ground SDI 2 20 I serial data in CLK 3 1 I serial data clock used to shift data on SDI into the shift register LE/DM1 4 2 I latch enable with internal pull-down resistor; active HIGH signal used to capture data in the shift register to present to the outputs Detection Mode 1 LED0 5 3 O constant current LED output driver 0 LED1 6 4 O constant current LED output driver 1 LED2 7 5 O constant current LED output driver 2 LED3 8 6 O constant current LED output driver 3 LED4 9 10 O constant current LED output driver 4 LED5 10 11 O constant current LED output driver 5 LED6 11 12 O constant current LED output driver 6 LED7 12 13 O constant current LED output driver 7 OE/DM2 13 14 I output enable with internal pull-up resistor; active LOW signal used to allow data captured in the latch to be presented to the constant current outputs Detection Mode 2 SDO 14 15 O serial data output R_EXT 15 16 analog input external resistor input VDD 16 17 power supply supply voltage n.c. - 7, 8, 9, 18 - not connected |
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