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NXP Semiconductors
PCA9553
4-bit I 2 C-bus LED driver with programmable blink rates
no acknowledge
from master
slave address
data from port
data from port
SDA S
1
1
0
0
0
1
0
1
A
DATA 1
A
DATA 4
NA P
START condition
R/W
acknowledge
from slave
acknowledge
from master
STOP
condition
read from
port
t h(D)
t su(D)
data into
port
DATA 2
DATA 3
DATA 4
002aad748
This ?gure assumes the command byte has previously been programmed with 00h.
PCA9553/01 shown.
Fig 14. Read input port register
9. Application design-in information
5V
5V
I 2 C-BUS/SMBus
MASTER
SDA
SCL
10 k ?
10 k ?
SDA
SCL
V DD
LED0
LED1
LED2
LED3
PCA9553
V SS
002aad749
Fig 15. Typical application
9.1 Minimizing I DD when the I/Os are used to control LEDs
When the I/Os are used to control LEDs, they are normally connected to V DD through a
resistor as shown in Figure 15 . Since the LED acts as a diode, when the LED is off the I/O
V I is about 1.2 V less than V DD . The supply current, I DD , increases as V I becomes lower
than V DD and is speci?ed as ? I DD in Table 13 “Static characteristics” .
Designs needing to minimize current consumption, such as battery power applications,
should consider maintaining the I/O pins greater than or equal to V DD when the LED is off.
Figure 16 shows a high value resistor in parallel with the LED. Figure 17 shows V DD less
than the LED supply voltage by at least 1.2 V. Both of these methods maintain the I/O V I at
or above V DD and prevents additional supply current consumption when the LED is off.
PCA9553_6
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 29 December 2008
11 of 26
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