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PCA9552BS,118

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PCA9552_5 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet Rev. 05 — 9 March 2006 13 of 28
Philips Semiconductors
PCA9552
16-bit I
2
C-bus LED driver with programmable blink rates
8. Application design-in information
8.1 Minimizing I
DD
when the I/O is 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 specified as ∆I
stb
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 15 shows a high value resistor in parallel with the LED. Figure 16 shows V
DD
less
than the LED supply voltage by at least 1.2 V. Both of these methods maintain the
input/output V
I
at or above V
DD
and prevents additional supply current consumption when
the LED is off.
LED0 to LED12 are used as LED drivers.
LED13 to LED15 are used as regular GPIOs.
Fig 14. Typical application
PCA9552
LED0
LED1
SDA
SCL
RESET
5 V
I
2
C-BUS/SMBus
MASTER
002aac188
SDA
SCL
V
DD
A2
A1
A0
V
SS
5 V
10 kΩ
(3×)
LED2
LED3
LED4
LED5
LED6
LED7
LED8
LED9
LED10
LED11
LED12
LED13
LED14
LED15
GPIOs
PCA9552_5 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet Rev. 05 — 9 March 2006 14 of 28
Philips Semiconductors
PCA9552
16-bit I
2
C-bus LED driver with programmable blink rates
8.2 Programming example
The following example will show how to set LED0 to LED3 on. It will then set LED4 and
LED5 to blink at 1 Hz at a 50 % duty cycle. LED6 and LED7 will be set to blink at 4 Hz and
at a 25 % duty cycle. LED8 to LED15 will be set to off.
Fig 15. High value resistor in parallel with
the LED
Fig 16. Device supplied by a lower voltage
002aac189
LED
V
DD
LEDn
100 kΩ
V
DD
002aac190
LED
V
DD
LEDn
3.3 V 5 V
Table 11: Programming PCA9552
Program sequence I
2
C-bus
START S
PCA9552 address with A0 to A2 = LOW C0h
PSC0 subaddress + Auto-Increment 12h
Set prescaler PSC0 to achieve a period of 1 second:
PSC0 = 43
2Bh
Set PWM0 duty cycle to 50 %:
PWM0 = 128
80h
Set prescaler PCS1 to achieve a period of 0.25 seconds:
PSC1 = 10
0Ah
Set PWM1 output duty cycle to 25 %:
PWM1 = 192
C0h
Set LED0 to LED3 on 00h
Set LED4 and LED5 to PWM0, and LED6 or LED7 to PWM1 FAh
Set LED8 to LED11 off 55h
Set LED12 to LED15 off 55h
STOP P
Blink period 1
PSC0 1+
44
-----------------------
==
256 PWM0–
256
--------------------------------
0.5=
Blink period 0.25
PSC1 1+
44
-----------------------
==
256 PWM1–
256
--------------------------------
0.25=
PCA9552_5 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet Rev. 05 — 9 March 2006 15 of 28
Philips Semiconductors
PCA9552
16-bit I
2
C-bus LED driver with programmable blink rates
9. Limiting values
10. Static characteristics
Table 12: Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter Conditions Min Max Unit
V
DD
supply voltage −0.5 +6.0 V
V
I/O
voltage on an input/output pin LEDn used as an I/O V
SS
− 0.5 5.5 V
I
O(LEDn)
output current on pin LEDn LEDn used as an I/O - ±25 mA
I
SS
ground supply current - 200 mA
P
tot
total power dissipation - 400 mW
T
stg
storage temperature −65 +150 °C
T
amb
ambient temperature operating −40 +85 °C
Table 13: Static characteristics
V
DD
= 2.3 V to 5.5 V; V
SS
=0V; T
amb
=
−
40
°
C to +85
°
C; unless otherwise specified.
Symbol Parameter Conditions Min Typ
[1]
Max Unit
Supply
V
DD
supply voltage 2.3 - 5.5 V
I
DD
supply current Operating mode; V
DD
= 5.5 V; no load;
V
I
=V
DD
or V
SS
; f
SCL
= 100 kHz
- 350 550 µA
I
stb
standby current Standby mode; V
DD
= 5.5 V; no load;
V
I
=V
DD
or V
SS
; f
SCL
= 0 kHz
- 2.1 5.0 µA
∆I
stb
additional standby current Standby mode; V
DD
= 5.5 V;
every LED I/O at V
I
= 4.3 V;
f
SCL
= 0 kHz
--2mA
V
POR
power-on reset voltage
[2]
V
DD
= 3.3 V; no load; V
I
=V
DD
or V
SS
- 1.7 2.2 V
Input SCL; input/output SDA
V
IL
LOW-level input voltage −0.5 - 0.3V
DD
V
V
IH
HIGH-level input voltage 0.7V
DD
- 5.5 V
I
OL
LOW-level output current V
OL
= 0.4 V 3 6.5 - mA
I
L
leakage current V
I
=V
DD
=V
SS
−1- +1µA
C
i
input capacitance V
I
=V
SS
- 4.4 5 pF
I/Os
V
IL
LOW-level input voltage −0.5 - 0.8 V
V
IH
HIGH-level input voltage 2.0 - 5.5 V
I
OL
LOW-level output current V
OL
= 0.4 V; V
DD
= 2.3 V
[3]
9--mA
V
OL
= 0.4 V; V
DD
= 3.0 V
[3]
12--mA
V
OL
= 0.4 V; V
DD
= 5.0 V
[3]
15--mA
V
OL
= 0.7 V; V
DD
= 2.3 V
[3]
15--mA
V
OL
= 0.7 V; V
DD
= 3.0 V
[3]
20--mA
V
OL
= 0.7 V; V
DD
= 5.0 V
[3]
25--mA
I
LI
input leakage current V
DD
= 3.6 V; V
I
= 0 V or V
DD
−1- +1µA
C
io
input/output capacitance - 2.6 5 pF
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PCA9552BS,118

Mfr. #:
Buy PCA9552BS,118
Manufacturer:
NXP Semiconductors
Description:
LED Lighting Drivers 16-BIT I2C FM OD LED BLK RST
Lifecycle:
New from this manufacturer.
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