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General Description
The MAX7315 I
2
CTM-/SMBus-compatible serial interfaced
peripheral provides microprocessors with 8 I/O ports.
Each I/O port can be individually configured as either an
open-drain current-sinking output rated at 50mA at 5.5V,
or a logic input with transition detection. A ninth port can
be used for transition detection interrupt or as a general-
purpose output. The outputs are capable of directly dri-
ving LEDs, or providing logic outputs with external
resistive pullup up to 5.5V.
PWM current drive is integrated with 8 bits of control.
Four bits are global control and apply to all LED outputs
to provide coarse adjustment of current from fully off to
fully on in 14 intensity steps. Each output then has indi-
vidual 4-bit control, which further divides the globally
set current into 16 more steps. Alternatively, the current
control can be configured as a single 8-bit control that
sets all outputs at once.
The MAX7315 is pin and software compatible with the
PCA9534 and PCA9554(A).
Each output has independent blink timing with two blink
phases. All LEDs can be individually set to be on or off
during either blink phase, or to ignore the blink control.
The blink period is controlled by a register.
The MAX7315 is controlled through the 2-wire I
2
C/SMBus
serial interface, and can be configured to one of 64 I
2
C
addresses.
Applications
Features
o 400kbps, 2-Wire Serial Interface, 5.5V Tolerant
o 2V to 3.6V Operation
o Overall 8-Bit PWM LED Intensity Control
Global 16-Step Intensity Control
Plus Individual 16-Step Intensity Control
o Automatic Two-Phase LED Blinking
o 50mA Maximum Port Output Current
o Outputs Are 5.5V-Rated Open Drain
o Inputs Are Overvoltage Protected to 5.5V
o Transition Detection with Interrupt Output
o Low Standby Current (1.2A typ; 3.3A max)
o Tiny 3mm x 3mm, Thin QFN Package
o -40C to +125C Temperature Range
o All Ports Can Be Configured as Inputs or Outputs
MAX7315
8-Port I/O Expander with LED Intensity
Control and Interrupt
________________________________________________________________ Maxim Integrated Products
1
16
15
14
13
AD0
V+
SDA
9
10
11
12
P6
P7
SCL
4
3
2
1
P2
P1
P0
5
6
7
8
P3
GND
P4
P5
AD2
INT/O8
AD1
QFN
TOP VIEW
MAX7315ATE
Pin Configurations
MAX7315
P5
P0
P1
P2
P3
V+
3.3V
C
SDA
SCL
SDA
I/O
AD0
5V 3.3V
P6
P7
SCL
P4
OUTPUT2
OUTPUT1
GND
5V
INPUT 1
INPUT 2
AD2
AD1
0.047
F
INT/O8
Typical Application Circuit
19-3056; Rev 0; 10/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
TOP
MARK
MAX7315ATE
-40
C to +125C
16 Thin QFN
3mm x 3mm x
0.8mm
AAU
MAX7315AEE
-40
C to +125C
16 QSOP
--
MAX7315AUE
-40
C to +125C
16 TSSOP
--
Pin Configurations continued at end of data sheet.
LCD Backlights
LED Status Indication
Portable Equipment
Laptop Computers
Keypad Backlights
RGB LED Drivers
Cellular Phones
Purchase of I
2
C components of Maxim Integrated Products, Inc.,
or one of its sublicensed Associated Companies, conveys a
license under the Philips I
2
C Patent Rights to use these compo-
nents in an I
2
C system, provided that the system conforms to the
I
2
C Standard Specification as defined by Philips.
MAX7315
8-Port I/O Expander with LED Intensity
Control and Interrupt
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage (with respect to GND)
V+ .............................................................................-0.3V to +4V
SCL, SDA, AD0, AD1, AD2, P0P7 ..........................-0.3V to +6V
INT/O8 .....................................................................-0.3V to +8V
DC Current on P0P7, INT/O8 ............................................55mA
DC Current on SDA.............................................................10mA
Maximum GND Current ....................................................190mA
Continuous Power Dissipation (T
A
= +70C)
16-Pin TSSOP (derate 9.4mW/C over +70C) ............754mW
16-Pin QSOP (derate 8.3mW/C over +70C)..............666mW
16-Pin QFN (derate 14.7mW/C over +70C) ............1176mW
Operating Temperature Range (TMIN to TMAX)-40C to +125C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
ELECTRICAL CHARACTERISTICS
(Typical Operating Circuit, V+ = 2V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= +25C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Voltage
V+
2
3.6
V
Output Load External Supply
Voltage
V
EXT
0
5.5
V
T
A
= +25C
1.2
2.3
T
A
= -40C to +85C
2.6
Standby Current
(Interface Idle, PWM Disabled)
I
+
S C L and S D A at V + ; other
d i g i tal i np uts at V + or GN D ;
P WM i ntensi ty contr ol d i sab l ed
T
A
= T
MIN
to T
MAX
3.3
A
T
A
= +25C
7
12.1
T
A
= -40C to +85C
13.5
Supply Current
(Interface Idle, PWM Enabled)
I
+
S C L and S D A at V + ; other
d i g i tal i np uts at V + or GN D ;
P WM i ntensi ty contr ol enab l ed
T
A
= T
MIN
to T
MAX
14.4
A
T
A
= +25C
40
76
T
A
= -40C to +85C
78
Supply Current
(Interface Running, PWM
Disabled)
I
+
f
SCL
= 400kHz; other digital
inputs at V+ or GND; PWM
intensity control disabled
T
A
= T
MIN
to T
MAX
80
A
T
A
= +25C
51
110
T
A
= -40C to +85C
117
Supply Current
(Interface Running, PWM
Enabled)
I
+
f
SCL
= 400kHz; other digital
inputs at V+ or GND; PWM
intensity control enabled
T
A
= T
MIN
to T
MAX
122
A
Input High Voltage
SDA, SCL, AD0, AD1, AD2,
P0P7
V
IH
0.7
V+
V
Input Low Voltage
SDA, SCL, AD0, AD1, AD2,
P0P7
V
IL
0.3
V+
V
Input Leakage Current
SDA, SCL, AD0, AD1, AD2,
P0P7
I
IH
, I
IL
0
input voltage 5.5V
-0.2
+0.2
A
Input Capacitance
SDA, SCL, AD0, AD1, AD2,
P0P7
8
pF
MAX7315
8-Port I/O Expander with LED Intensity
Control and Interrupt
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, V+ = 2V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= + 25C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
T
A
= +25C
0.15
0.25
T
A
= -40C to +85C
0.29
V+ = 2V, I
SINK
= 20mA
T
A
= T
MIN
to T
MAX
0.31
T
A
= +25C
0.13
0.22
T
A
= -40C to +85C
0.25
V+ = 2.5V, I
SINK
= 20mA
T
A
= T
MIN
to T
MAX
0.27
T
A
= +25C
0.12
0.22
T
A
= -40C to +85C
0.23
Output Low Voltage
P0P7, INT/O8
V
OL
V+ = 3.3V, I
SINK
= 20mA
T
A
= T
MIN
to T
MAX
0.25
V
Output Low-Voltage SDA
V
OLSDA
I
SINK
= 6mA
0.4
V
PWM Clock Frequency
f
PWM
32
kHz
TIMING CHARACTERISTICS
(Typical Operating Circuit, V+ = 2V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= +25C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Serial Clock Frequency
f
SCL
400
kHz
Bus Free Time Between a STOP and a START
Condition
t
BUF
1.3
s
Hold Time, Repeated START Condition
t
HD, STA
0.6
s
Repeated START Condition Setup Time
t
SU, STA
0.6
s
STOP Condition Setup Time
t
SU, STO
0.6
s
Data Hold Time
t
HD, DAT
(Note 2)
0.9
s
Data Setup Time
t
SU, DAT
180
ns
SCL Clock Low Period
t
LOW
1.3
s
SCL Clock High Period
t
HIGH
0.7
s
Rise Time of Both SDA and SCL Signals, Receiving
t
R
(Notes 3, 4)
200 +
0.1C
b
300
ns
Fall Time of Both SDA and SCL Signals, Receiving
t
F
(Notes 3, 4)
200 +
0.1C
b
300
ns
Fall Time of SDA Transmitting
t
F.TX
(Notes 3, 5)
200 +
0.1C
b
250
ns
Pulse Width of Spike Suppressed
t
SP
(Note 6)
50
ns
Capacitive Load for Each Bus Line
C
b
(Note 3)
400
pF
MAX7315
8-Port I/O Expander with LED Intensity
Control and Interrupt
4
_______________________________________________________________________________________
TIMING CHARACTERISTICS (continued)
(Typical Operating Circuit, V+ = 2V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= +25C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Interrupt Valid
t
IV
Figure 10
6.5
s
Interrupt Reset
t
IR
Figure 10
1
s
Output Data Valid
t
DV
Figure 10
5
s
Input Data Step Time
t
DS
Figure 10
100
ns
Input Data Hold Time
t
DH
Figure 10
1
s
Note 1: All parameters tested at T
A
= +25C. Specifications over temperature are guaranteed by design.
Note 2: A master device must provide a hold time of at least 300ns for the SDA signal (referred to V
IL
of the SCL signal) to bridge
the undefined region of SCL's falling edge.
Note 3: Guaranteed by design.
Note 4: C
b
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3 x V
DD
and 0.7 x V
DD
.
Note 5: I
SINK
6mA. C
b
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3 x V
DD
and 0.7 x V
DD
.
Note 6: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
STANDBY CURRENT vs. TEMPERATURE
MAX7315 toc01
TEMPERATURE (
C)
STANDBY CURRENT (
A)
110
95
65 80
-10 5
20 35 50
-25
1
2
3
4
5
6
7
8
9
10
0
-40
125
V+ = 3.6V
PWM ENABLED
V+ = 2.7V
PWM ENABLED
V+ = 2V
PWM DISABLED
V+ = 2.7V
PWM DISABLED
V+ = 3.6V
PWM
DISABLED
V+ = 2V
PWM ENABLED
SUPPLY CURRENT vs. TEMPERATURE
(PWM DISABLED; f
SCL
= 400kHz)
MAX7315 toc02
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
110
95
65 80
-10 5
20 35 50
-25
10
20
30
40
50
60
70
0
-40
125
V+ = 3.6V
V+ = 2.7V
V+ = 2V
5
10
15
20
25
30
35
40
45
50
55
60
65
70
0
SUPPLY CURRENT vs. TEMPERATURE
(PWM ENABLED; f
SCL
= 400kHz)
MAX7315 toc03
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
110
95
65 80
-10 5
20 35 50
-25
-40
125
V+ = 3.6V
V+ = 2.7V
V+ = 2V
__________________________________________Typical Operating Characteristics
(T
A
= +25C, unless otherwise noted.)
MAX7315
8-Port I/O Expander with LED Intensity
Control and Interrupt
_______________________________________________________________________________________
5
PORT OUTPUT LOW VOLTAGE WITH 50mA
LOAD CURRENT vs. TEMPERATURE
PORT OUTPUT LOW VOLTAGE V
OL
(V)
0.1
0.2
0.3
0.4
0.5
0.6
0
MAX7315 toc04
TEMPERATURE (
C)
110
95
65 80
-10 5
20 35 50
-25
-40
125
V+ = 3.6V
V+ = 2.7V
V+ = 2V
PORT OUTPUT LOW VOLTAGE WITH 20mA
LOAD CURRENT vs. TEMPERATURE
MAX7315 toc05
TEMPERATURE (
C)
PORT OUTPUT LOW VOLTAGE V
OL
(V)
110
95
80
65
50
35
20
5
-10
-25
0.1
0.2
0.3
0.4
0.5
0.6
0
-40
125
ALL OUTPUTS LOADED
V+ = 3.6V
V+ = 2.7V
V+ = 2V
PWM CLOCK FREQUENCY
vs. TEMPERATURE
MAX7315 toc06
TEMPERATURE (
C)
PWM CLOCK FREQUENCY
110
95
80
65
50
35
20
5
-10
-25
0.950
1.000
1.050
0.900
0.925
0.975
1.025
-40
125
V+ = 3.6V
V+ = 2V
V+ = 2.7V
NORMALIZED TO V+ = 3.3V, T
A
= +25
C
SCOPE SHOT OF 2 OUTPUT PORTS
MAX7315 toc07
2ms/div
OUTPUT 1
2V/div
OUTPUT 2
2V/div
MASTER INTENSITY SET TO 1/15
OUTPUT 1 INDIVIDUAL INTENSITY
SET TO 1/16
OUTPUT 2 INDIVIDUAL INTENSITY
SET TO 15/16
SCOPE SHOT OF 2 OUTPUT PORTS
MAX7315 toc08
2ms/div
OUTPUT 1,
2V/div
OUTPUT 2,
2V/div
OUTPUT 1 INDIVIDUAL INTENSITY
SET TO 1/16
MASTER INTENSITY SET TO 14/15
OUTPUT 2 INDIVIDUAL INTENSITY
SET TO 14/15
SINK CURRENT vs. V
OL
MAX7315 toc09
SINK CURRENT (mA)
V
OL
(V)
50
40
30
20
10
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0
0
V+ = 2V
V+ = 2.7V
ONLY ONE OUTPUT LOADED
V+ = 3.3V
V+ = 3.6V
Typical Operating Characteristics (continued)
(T
A
= +25C, unless otherwise noted.)
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