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PCA9557BSHP

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
PCA9557 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 7 — 10 December 2013 13 of 30
NXP Semiconductors
PCA9557
8-bit I
2
C-bus and SMBus I/O port with reset
9. Application design-in information
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 18
. 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
.
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 19
shows a high value resistor in parallel with the LED. Figure 20 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.
Device address configured as 0011 100x for this example.
IO0, IO2, IO3 configured as outputs.
IO1, IO4, IO5 configured as inputs.
IO6, IO7 are not used.
Fig 18. Typical application
PCA9557
IO0
IO1
SCL
SDA
V
DD
002aad285
SCL
SDA
IO2
IO3
V
DD
V
SS
MASTER
CONTROLLER
V
SS
V
DD
(5 V)
620 Ω
SUBSYSTEM 1
(e.g., temp. sensor)
INT
SUBSYSTEM 2
(e.g., counter)
RESET
controlled switch
(e.g., CBT device)
A
B
enable
RESETRESET
2 kΩ 2 kΩ
SUBSYSTEM 3
(e.g., alarm system)
ALARM
IO4
IO5
V
DD
A2
A1
A0
IO6
IO7
100 kΩ
(× 5)
1.8 kΩ1.8 kΩ
PCA9557 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 7 — 10 December 2013 14 of 30
NXP Semiconductors
PCA9557
8-bit I
2
C-bus and SMBus I/O port with reset
10. Limiting values
Fig 19. High value resistor in parallel with
the LED
Fig 20. Device supplied by a lower voltage
002aac660
LED
V
DD
IOn
100 kΩ
V
DD
002aac661
LED
V
DD
IOn
3.3 V 5 V
Table 9. 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 V
V
I
input voltage V
SS
0.5 5.5 V
I
I
input current - 20 mA
I
IHL(max)
maximum allowed input current
through protection diode (IO1 to IO7)
V
I
V
DD
or V
I
V
SS
- 400 A
V
I/O
voltage on an input/output pin I/O as an input, except IO0 V
SS
0.5 5.5 V
IO0 as an input V
SS
0.5 5.5 V
I
I/O
input/output current IO0 as an input - +400 A
- 20 mA
I
O(IOn)
output current on pin IOn - 50 mA
I
DD
supply current - 85 mA
I
SS
ground supply current - 100 mA
P
tot
total power dissipation - 200 mW
T
stg
storage temperature 65 +150 C
T
amb
ambient temperature operating 40 +85 C
PCA9557 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 7 — 10 December 2013 15 of 30
NXP Semiconductors
PCA9557
8-bit I
2
C-bus and SMBus I/O port with reset
11. Static characteristics
[1] V
DD
must be lowered to 0.2 V in order to reset part.
[2] The total amount sunk by all I/Os must be limited to 100 mA and 25 mA per bit.
[3] The total current sourced by all I/Os must be limited to 85 mA and 20 mA per bit.
Table 10. 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 Max Unit
Supplies
V
DD
supply voltage 2.3 - 5.5 V
I
DD
supply current operating mode; V
DD
=5.5V;
no load; f
SCL
= 100 kHz
-1925A
I
stbL
LOW-level standby current standby mode; V
DD
=5.5V;
no load; V
I
=V
SS
; f
SCL
= 0 kHz;
I/O = inputs
-0.251A
I
stbH
HIGH-level standby current standby mode; V
DD
=5.5V;
no load; V
I
=V
DD
; f
SCL
= 0 kHz;
I/O = inputs
-0.251A
I
stb
additional standby current standby mode; V
DD
=5.5V;
every LED I/O at V
I
=4.3V;
f
SCL
= 0 kHz
-0.81mA
V
POR
power-on reset voltage no load; V
I
=V
DD
or V
SS
[1]
-1.652.1V
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
-5.5V
I
OL
LOW-level output current V
OL
=0.4V; V
DD
=2.3V 3--mA
I
L
leakage current V
I
=V
DD
or V
SS
1- +1A
C
i
input capacitance V
I
=V
SS
-610pF
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
=5.5V; V
DD
=2.3V
[2]
810- mA
I
OH
HIGH-level output current except pin IO0; V
OH
=2.4V
[3]
4--mA
pin IO0; V
OH
=4.6V --1A
pin IO0; V
OH
=3.3V --1A
I
LI
input leakage current V
DD
=5.5V; V
I
=V
SS
--100 A
C
i
input capacitance - 3.7 5 pF
C
o
output capacitance - 3.7 5 pF
Select inputs A0, A1, A2 and 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- +1A
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PCA9557BSHP

Mfr. #:
Buy PCA9557BSHP
Manufacturer:
NXP Semiconductors
Description:
Interface - I/O Expanders 8-bit I2C-bus and SMBus I/O port with reset
Lifecycle:
New from this manufacturer.
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