pca9952 NXP Semiconductors, pca9952 Datasheet - Page 8

• Manufacturer Part Number: pca9952
• Description: 16-channel Fm+ I 2c-bus 57 Ma Constant Current Led Driver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
7. Functional description
PCA9952_PCA9955
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.
For PCA9955 there are a maximum of 16 possible programmable addresses using the
4 hardware address pins.
For PCA9952 there are a maximum of 8 possible programmable addresses using the
3 hardware address pins.
The I
internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW externally.
the PCA9952.
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
Fig 3.
•
•
•
•
•
•
•
‘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 000X
Programmable through I
At power-up, LED All Call I
when E0h (R/W = 0) or E1h (R/W = 1) is sent by the master.
Section 7.3.10 “ALLCALLADR, LED All Call I
2
C-bus slave address of the PCA9955 is shown in
1
Figure 1 “Block diagram of
PCA9955 slave address
2
fixed
C-bus slave address
1
slave address
2
All information provided in this document is subject to legal disclaimers.
0
C-bus address
A3
2
C-bus addresses must be used with caution since they can interfere
Rev. 1 — 2 December 2011
selectable
hardware
A2
16-channel Fm+ I
A1
2
2
C-bus (volatile programming)
C-bus addresses (0000 011, 1111 1XX)
2
A0 R/W
002aae914
C-bus address is enabled. PCA9952/55 sends an ACK
PCA9952/55”.
2
Figure 4
C-bus 57 mA constant current LED driver
Fig 4.
PCA9952; PCA9955
2
C-bus address”
1
shows the I
PCA9952 slave address
Figure
1
fixed
slave address
0
3. To conserve power, no
0
2
C-bus slave address of
for more detail.
A2
selectable
hardware
© NXP B.V. 2011. All rights reserved.
A1
A0 R/W
002aae915
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