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PCA9621PW Datasheet(PDF) 9 Page - NXP Semiconductors |
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PCA9621PW Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 18 page PCA9621 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 1 — 9 March 2011 9 of 18 NXP Semiconductors PCA9621 65 mA 8-bit 2-wire bus output port 11. Application information Figure 11 shows the PCA9621 in conjunction with the PCA9646 bus multiplexer in a LED drive application. Each PCA9621 can drive 8 LEDs, and using the address pins on the IC, up to 8 uniquely addressed devices can sit on one bus branch. The PCA9646 has four such outputs, giving 256 LEDs in the structure shown. By additionally using the address pins on the PCA9646, the entire structure may be repeated 8 times, allowing 2048 LEDs to be uniquely driven. By additionally placing PCA9646’s in series (refer to the PCA9646 data sheet), the structure may be further extensively multiplied into a huge array. Fig 11. PCA9621 in a large LED array 002aaf397 BUS MASTER U2 VDD SCL SDA R8 SC0 SD0 SCL SDA PCA9646 VDD SC0 SD0 U1 RESET 5 V PCA9621 U3 U10 R7 R1 R2 SC2 SD2 SC2 SD2 R3 R4 SC3 SD3 SC3 SD3 R5 R6 buses SC2/SD2, SC3/SD3 as shown for SC0/SD0, SC1/SD1 Entire structure can be repeated 8 times using PCA9646 address pins (further expansion possible). A0 A1 A2 VSS R10 SC1 SD1 SC1 SD1 PCA9621 U11 U18 R9 8 P[7:0] 8 LEDs 8 P[7:0] 8 LEDs 8 × PCA9621 each with 8 LEDs = 64 LEDs PCA9621 8 P[7:0] 8 LEDs PCA9621 8 P[7:0] 8 LEDs 8 × PCA9621 each with 8 LEDs = 64 LEDs |
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