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NXP Semiconductors
PCA9634
8-bit Fm+ I 2 C-bus LED driver
7.3.8 ALLCALLADR: LED All Call I 2 C-bus address
Table 12.
ALLCALLADR - LED All Call I 2 C-bus address register (address 11h) bit
description
Legend: * default value.
Address
Register
Bit
Symbol
Access Value
Description
11h
ALLCALLADR
7:1
AC[7:1]
R/W
1110 000*
ALLCALL I 2 C-bus
address register
0
AC[0]
R only
0*
reserved
The LED All Call I 2 C-bus address allows all the PCA9634s on the bus to be programmed
at the same time (ALLCALL bit in register MODE1 must be equal to 1 (power-up default
state)). This address is programmable through the I 2 C-bus and can be used during either
an I 2 C-bus read or write sequence. The register address can also be programmed as a
Sub Call.
Only the 7 MSBs representing the All Call I 2 C-bus address are valid. The LSB in
ALLCALLADR register is a read-only bit (0).
If ALLCALL bit = 0, the device does not acknowledge the address programmed in register
ALLCALLADR.
7.4 Active LOW output enable input
The active LOW output enable (OE) pin, allows to enable or disable all the LED outputs at
the same time.
? When a LOW level is applied to OE pin, all the LED outputs are enabled and follow the
output state de?ned in the LEDOUT register with the polarity de?ned by INVRT bit
(MODE2 register).
? When a HIGH level is applied to OE pin, all the LED outputs are programmed to the
value that is de?ned by OUTNE[1:0] in the MODE2 register.
Table 13.
LED outputs when OE = 1
OUTNE1
0
0
1
1
OUTNE0
0
1
0
1
LED outputs
0
1 if OUTDRV = 1, high-impedance if OUTDRV = 0
high-impedance
reserved
The OE pin can be used as a synchronization signal to switch on/off several PCA9634
devices at the same time. This requires an external clock reference that provides blinking
period and the duty cycle.
The OE pin can also be used as an external dimming control signal. The frequency of the
external clock must be high enough not to be seen by the human eye, and the duty cycle
value determines the brightness of the LEDs.
Remark: Do not use OE as an external blinking control signal when internal global
blinking is selected (DMBLNK = 1, MODE2 register) since it will result in an unde?ned
blinking pattern. Do not use OE as an external dimming control signal when internal global
dimming is selected (DMBLNK = 0, MODE2 register) since it will result in an unde?ned
dimming pattern.
PCA9634_6
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 12 September 2008
15 of 38
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