pca9634 NXP Semiconductors, pca9634 Datasheet - Page 7

• Manufacturer Part Number: pca9634
• Description: Pca9634 8-bit Fm I2c-bus Led Driver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
7. Functional description
PCA9634_4
Product data sheet
7.1.1 Regular I
7.1.2 LED All Call I
7.1 Device addresses
Refer to
Following a START condition, the bus master must output the address of the slave it is
accessing.
There are a maximum of 128 possible programmable addresses using the 7 hardware
address pins. Two of these addresses, Software Reset and LED All Call, cannot be used
because their default power-up state is ON, leaving a maximum of 126 addresses. Using
other reserved addresses, as well as any other subcall address, will reduce the total
number of possible addresses even further.
The I
internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW.
Remark: Reserved I
with:
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.
See
Remark: The default LED All Call I
as a regular I
PCA9634s on the I
Fig 5. Slave address
•
•
•
•
•
•
•
‘reserved for future use’ I
slave devices that use the 10-bit addressing scheme (1111 0XX)
slave devices that are designed to respond to the General Call address (0000 000)
High-speed mode (Hs-mode) master code (0000 1XX).
Default power-up value (ALLCALLADR register): E0h or 1110 000
Programmable through I
At power-up, LED All Call I
E0h (R/W = 0) or E1h (R/W = 1) is sent by the master.
Section 7.3.8 “ALLCALLADR: LED All Call I
2
C-bus slave address of the PCA9634 is shown in
Figure 1 “Block diagram of
2
C-bus slave address
2
C-bus slave address since this address is enabled at power-up. All the
2
C-bus address
2
C-bus will acknowledge the address if sent by the I
2
C-bus addresses must be used with caution since they can interfere
Rev. 04 — 5 January 2007
2
2
C-bus (volatile programming)
C-bus addresses (0000 011, 1111 1XX)
A6
2
C-bus address is enabled. PCA9634 sends an ACK when
A5
2
hardware selectable
PCA9634”.
C-bus address (E0h or 1110 000) must not be used
slave address
A4
A3
A2
2
C-bus address”
A1
002aab319
A0
Figure
R/W
8-bit Fm+ I
5. To conserve power, no
for more detail.
PCA9634
2
2
© NXP B.V. 2007. All rights reserved.
C-bus LED driver
C-bus master.
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