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PCA9633PW Datasheet(PDF) 9 Page - NXP Semiconductors

Part # PCA9633PW
Description  4-bit Fm I2C-bus LED driver
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA9633PW Datasheet(HTML) 9 Page - NXP Semiconductors

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PCA9633_3
© NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 03 — 20 December 2006
9 of 42
NXP Semiconductors
PCA9633
4-bit Fm+ I2C-bus LED driver
Remark: The default LED All Call I2C-bus address (E0h or 1110 000) must not be used
as a regular I2C-bus slave address since this address is enabled at power-up. All the
PCA9633s on the I2C-bus will acknowledge the address if sent by the I2C-bus master.
7.1.3 LED Sub Call I2C-bus addresses
3 different I2C-bus addresses can be used
Default power-up values:
– SUBADR1 register: E2h or 1110 001
– SUBADR2 register: E4h or 1110 010
– SUBADR3 register: E8h or 1110 100
Programmable through I2C-bus (volatile programming)
At power-up, Sub Call I2C-bus addresses are disabled. PCA9633 does not send an
ACK when E2h (R/W = 0) or E3h (R/W = 1), E4h (R/W = 0) or E5h (R/W = 1), or
E8h (R/W = 0) or E9h (R/W = 1) is sent by the master.
See Section 7.3.7 “I2C-bus subaddress 1 to 3, SUBADRx” for more detail.
Remark: The default LED Sub Call I2C-bus addresses may be used as regular I2C-bus
slave addresses as long as they are disabled.
7.1.4 Software Reset I2C-bus address
The address shown in Figure 9 is used when a reset of the PCA9633 needs to be
performed by the master. The Software Reset address (SWRST Call) must be used with
R/W = 0. If R/W = 1, the PCA9633 does not acknowledge the SWRST. See Section 7.6
“Software Reset” for more detail.
Remark: The Software Reset I2C-bus address is a reserved address and cannot be used
as a regular I2C-bus slave address (16-pin version) or as an LED All Call or LED Sub Call
address.
7.2 Control register
Following the successful acknowledgement of the slave address, LED All Call address or
LED Sub Call address, the bus master will send a byte to the PCA9633, which will be
stored in the Control register.
The lowest 4 bits are used as a pointer to determine which register will be accessed
(D[3:0]). The highest 3 bits are used as Auto-Increment flag and Auto-Increment options
(AI[2:0]). Bit 4 is unused and must be programmed with zero (0) for proper device
operation.
Fig 9.
Software Reset address
0
002aab416
0
0
0
0
0
1
1
R/W


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