36-Pin SSOP (derate at 11.8mW/°C above +70°C) .....941mW
40-Pin TQFN (derate at 25.6mW/°C above +70°C)....2051.3mW
Operating Temperature Range
(T
MIN
to T
MAX
) ...............................................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
DC ELECTRICAL CHARACTERISTICS
(Typical Operating Circuit, V+ = 2.7V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
Operating Supply Voltage
Shutdown Supply Current
SYMBOL
V+
I
SHDN
Shutdown mode, all
digital inputs at V+
or GND
T
A
= +25°C
T
A
= T
MIN
to T
MAX
22
CONDITIONS
MIN
2.7
10
TYP
MAX
5.5
35
µA
40
30
mA
35
UNITS
V
Operating Supply Current
I+
All segments on, all
T
A
= +25°C
digits scanned,
intensity set to full,
internal oscillator, no
display or OSC_OUT T
A
= T
MIN
to T
MAX
load connected
OSC = RC oscillator, R
SET
= 56kΩ,
C
SET
= 22pF, V+ = 3.3V
OSC driven externally
1
Master Clock Frequency
Dead Clock Protection Frequency
OSC Internal/External Detection
Threshold
OSC High Time
OSC Low Time
Slow Segment Blink Period
Fast Segment Blink Period
Fast or Slow Segment Blink Duty
Cycle
f
OSC
f
OSC
V
OSC
t
CH
t
CL
4
8
95
1.7
50
50
1
0.5
49.5
50.5
MHz
kHz
V
ns
ns
s
s
%
OSC = RC oscillator, R
SET
= 56kΩ,
f
SLOWBLINK
C
SET
= 22pF, V+ = 3.3V
f
FASTBLINK
OSC = RC oscillator, R
SET
= 56kΩ,
C
SET
= 22pF, V+ = 3.3V
2
Maxim Integrated
MAX6955
2-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
DC ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, V+ = 2.7V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
V
LED
= 2.2V,
V+ = 3.3V
Segment Drive Source Current
I
SEG
V
LED
= 2.2V,
V+ = 2.7V
T
A
= +25°C
-32
-40
-48
mA
CONDITIONS
MIN
TYP
MAX
UNITS
Segment Current Slew Rate
Segment Drive Current Matching
LOGIC INPUTS AND OUTPUTS
Input High Voltage
SDA, SCL, AD0, AD1
Input Low Voltage
SDA, SCL, AD0, AD1
Input Leakage Current
SDA, SCL, AD0, AD1, OSC, P0,
P1, P2, P3, P4/IRQ
SDA Output Low Voltage
Port Logic-High Input Voltage
P0, P1, P2, P3, P4/IRQ
Port Logic-Low Input Voltage
P0, P1, P2, P3, P4/IRQ
Port Hysteresis Voltage
P0, P1, P2, P3, P4/IRQ
Port Input Pullup Current from V+
Port Output Low Voltage
Blink Output Low Voltage
OSC_OUT Output High Voltage
OSC_OUT Output Low Voltage
∆I
SEG
/∆t
∆I
SEG
T
A
= +25°C, V+ = 3.3V
T
A
= +25°C, V+ = 3.3V
0.7 x
V+
11
5
mA/µs
%
V
IH
V
IL
V
0.3 x
V+
V
I
IH
, I
IL
V
OLSDA
V
IHP
V
ILP
∆V
IP
I
IPU
V
OLP
V
OLBK
V
OHOSC
V
OLOSC
P0 to P3 configured as key-scan inputs,
V+ = 3.3V
I
SINK
= 8mA
I
SINK
= 0.6mA
I
SOURCE
= 1.6mA
I
SINK
= 1.6mA
I
SINK
= 6mA
-1
+1
0.4
µA
V
V
0.7 x
V+
0.3 x
V+
0.03 x
V+
75
0.3
0.1
V+ -
0.4
0.4
0.5
0.3
V
V
µA
V
V
V
V
Maxim Integrated
3
MAX6955
2-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
TIMING CHARACTERISTICS
(Typical Operating Circuit, V+ = 2.7V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
TIMING CHARACTERISTICS
Serial Clock Frequency
Bus Free Time Between a STOP
and a START Condition
Hold Time (Repeated) START
Condition
Repeated START Condition Setup
Time
STOP Condition Setup Time
Data Hold Time
Data Setup Time
SCL Clock Low Period
SCL Clock High Period
Rise Time of Both SDA and SCL
Signals, Receiving
Fall Time of Both SDA and SCL
Signals, Receiving
Fall Time of SDA Transmitting
Pulse Width of Spike Suppressed
Capacitive Load for Each
Bus Line
f
SCL
t
BUF
t
HD,
t
STA
t
SU
, t
STA
t
SU:STO
t
HD
, t
DAT
t
SU
, t
DAT
t
LOW
t
HIGH
t
R
t
F
t
F
, t
X
t
SP
C
B
(Notes 2, 4)
(Notes 2, 4)
(Notes 2, 5)
(Notes 2, 6)
(Note 2)
0
400
(Note 3)
100
1.3
0.6
20 +
0.1C
B
20 +
0.1C
B
20 +
0.1C
B
300
300
300
50
1.3
0.6
0.6
0.6
0.9
400
kHz
µs
µs
µs
µs
µs
ns
µs
µs
ns
ns
ns
ns
pF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2:
Guaranteed by design.
Note 3:
A master device must provide a hold time of at least 300ns for the SDA signal (referred to V
IL
- of the SCL signal) in order to
bridge the undefined region of SCL’s falling edge.
Note 4:
C
B
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3V+ and 0.7V+.
Note 5:
I
SINK
≤
6mA. C
B
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3V+ and 0.7V+.
Note 6:
Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
4
Maxim Integrated
MAX6955
2-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
Typical Operating Characteristics
(V+ = 3.3V, LED forward voltage = 2.4V, Typical Application Circuit, T
For healthcare professionals, accurate diagnosis and treatment are crucial for a clear picture of a person's health. However, healthcare professionals often rely on tests at medical facilities, cli...[详细]
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