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PCA9530D,118

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PCA9530_3 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 03 — 26 February 2009 10 of 24
NXP Semiconductors
PCA9530
2-bit I
2
C-bus LED dimmer
8. Application design-in information
8.1 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 13. 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
DD
in Table 12 “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 14 shows a high value resistor in parallel with the LED. Figure 15 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 prevent additional supply current consumption when the LED is off.
Fig 13. Typical application
PCA9530
LED0
LED1
SDA
SCL
RESET
3.3 V
I
2
C-BUS/SMBus
MASTER
002aae501
SDA
SCL
V
DD
A0
V
SS
5 V
10 kΩ10 kΩ10 kΩ
Fig 14. High value resistor in parallel with
the LED
Fig 15. 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
PCA9530_3 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 03 — 26 February 2009 11 of 24
NXP Semiconductors
PCA9530
2-bit I
2
C-bus LED dimmer
8.2 Programming example
The following example will show how to set LED0 to blink at 1 Hz at a 50 % duty cycle.
LED1 will be set to be dimmed at 25 % of their maximum brightness (duty cycle = 25 %).
9. Limiting values
Table 10. Programming PCA9530
Program sequence I
2
C-bus
START S
PCA9530 address with A0 = LOW C0h
PSC0 subaddress + Auto-Increment 11h
Set prescaler PSC0 to achieve a period of 1 second:
PSC0 = 151
97h
Set PWM0 duty cycle to 50 %:
PWM0 = 128
80h
Set prescaler PCS1 to dim at maximum frequency:
PSC1 = 0
00h
Set PWM1 output duty cycle to 25 %:
PWM1 = 64
40h
Set LED0 to PWM0, and set LED1 to blink at PWM1 0Eh
STOP P
Blink period 1
PSC0 1+
152
------------------------
==
PWM0
256
-----------------
0.5=
Blink period max=
PWM1
256
-----------------
0.25=
Table 11. 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 V
SS
− 0.5 5.5 V
I
O(LEDn)
output current on pin LEDn - +25 mA
I
SS
ground supply current - 50 mA
P
tot
total power dissipation - 400 mW
T
stg
storage temperature −65 +150 °C
T
amb
ambient temperature operating −40 +85 °C
PCA9530_3 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 03 — 26 February 2009 12 of 24
NXP Semiconductors
PCA9530
2-bit I
2
C-bus LED dimmer
10. Static characteristics
[1] Typical limits at V
DD
= 3.3 V, T
amb
=25°C.
[2] Additional current for one LED I/O at a time where V
I
= 4.3 V,
[3] V
DD
must be lowered to 0.2 V in order to reset part.
[4] Each I/O must be externally limited to a maximum of 25 mA and the device must be limited to a maximum current of 50 mA.
Table 12. 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
Supplies
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
- 350 500 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
- 1.9 5.0 µA
∆I
DD
additional quiescent
supply current
Standby mode; V
DD
= 5.5 V;
every LED I/O at V
I
= 4.3 V;
f
SCL
= 0 kHz
[2]
- - 200 µA
V
POR
power-on reset voltage no load; V
I
=V
DD
or V
SS
[3]
- 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- +1 µA
C
i
input capacitance V
I
=V
SS
- 3.7 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
[4]
9-- mA
V
DD
= 3.0 V
[4]
12 - - mA
V
DD
= 5.0 V
[4]
15 - - mA
V
OL
= 0.7 V
V
DD
= 2.3 V
[4]
15 - - mA
V
DD
= 3.0 V
[4]
20 - - mA
V
DD
= 5.0 V
[4]
25 - - mA
I
L
input leakage current V
DD
= 3.6 V; V
I
= 0 V or V
DD
−1- +1 µA
C
io
input/output capacitance - 2.1 5 pF
Select inputs A0,
RESET
V
IL
LOW-level input voltage −0.5 - +0.8 V
V
IH
HIGH-level input voltage 2.0 - 5.5 V
I
LI
input leakage current −1- +1 µA
C
i
input capacitance V
I
=V
SS
- 2.3 5 pF
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PCA9530D,118

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Buy PCA9530D,118
Manufacturer:
NXP Semiconductors
Description:
LED Lighting Drivers 2-BIT I2C FM OD LED
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