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PCA9552D 用户编程技术手册 - NXP（恩智浦）
制造商:
NXP（恩智浦）
分类:
LED驱动器
封装:
SOIC
描述:
16位I2C总线LED驱动器，具有可编程闪烁速率 16-bit I2C-bus LED driver with programmable blink rates
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PCA9552D数据手册
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PCA9552_5 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet Rev. 05 — 9 March 2006 5 of 28
Philips Semiconductors
PCA9552
16-bit I
2
C-bus LED driver with programmable blink rates
6. Functional description
Refer to Figure 1 “Block diagram of PCA9552”.
6.1 Device address
Following a START condition, the bus master must output the address of the slave it is
accessing. The address of the PCA9552 is shown in Figure 5. To conserve power, no
internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW.
The last bit of the address byte defines the operation to be performed. When set to logic 1
a read is selected, while a logic 0 selects a write operation.
6.2 Control Register
Following the successful acknowledgement of the slave address, the bus master will send
a byte to the PCA9552, which will be stored in the Control Register. This register can be
read and written via the I
2
C-bus.
The lowest 3 bits are used as a pointer to determine which register will be accessed.
If the Auto-Increment flag (AI) is set, the four low order bits of the Control Register are
automatically incremented after a read or write. This allows the user to program the
registers sequentially. The contents of these bits will rollover to ‘0000’ after the last
register is accessed.
When the Auto-Increment flag is set (AI = 1) and a read sequence is initiated, the
sequence must start by reading a register different from ‘0' (B3 B2 B1 B0 ≠ 0000).
Only the 4 least significant bits are affected by the AI flag. Unused bits must be
programmed with zeroes.
Fig 5. PCA9552 address
002aac169
1 1 0 0 A2 A1 A0 R/W
fixed
slave address
programmable
Reset state: 00h
Fig 6. Control Register
002aac170
0 0 0 AI B3 B2 B1 B0
register address
Auto-Increment flag
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