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PDF MAX7300AAX Data sheet ( Hoja de datos )
| Número de pieza | MAX7300AAX | |
| Descripción | 20-Port or 28-Port I/O Expander | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX7300
2-Wire-Interfaced, 2.5V to 5.5V,
20-Port or 28-Port I/O Expander
General Description
The MAX7300 compact, serial-interfaced, I/O expansion
peripheral provides microprocessors with up to 28 ports.
Each port is individually user configurable to either a logic
input or logic output.
Each port can be configured as either a push-pull logic
output capable of sinking 10mA and sourcing 4.5mA, or
a Schmitt logic input with optional internal pullup. Seven
ports feature configurable transition detection logic, which
generates an interrupt upon change of port logic level. The
MAX7300 is controlled through an I2C-compatible 2-wire
serial interface, and uses four-level logic to allow 16 I2C
addresses from only two select pins.
The MAX7300AAX and MAX7300ATL have 28 ports and
are available in 36-pin SSOP and 40-pin TQFN packages,
respectively. The MAX7300AAI and MAX7300ATI have 20
ports and are available in 28-pin SSOP and TQFN pack-
ages. For an SPI-interfaced version, refer to the MAX7301
data sheet. For a pin-compatible port expander with addi-
tional 24mA constant-current LED drive capability, refer to
the MAX6956 data sheet.
Application
●● White Goods
●● Industrial Controllers
●● System Monitoring
Pin Configurations
TOP VIEW
ISET 1
GND 2
GND 3
AD0 4
P12 5
P13 6
P14 7
P15 8
P16 9
P17 10
P18 11
P19 12
P20 13
P21 14
MAX7300
28 V+
27 AD1
26 SCL
25 SDA
24 P31
23 P30
22 P29
21 P28
20 P27
19 P26
18 P25
17 P24
16 P23
15 P22
28 SSOP
Pin Configurations continued at end of data sheet.
Features
●● 400kbps I2C-Compatible Serial Interface
●● 2.5V to 5.5V Operation
●● -40°C to +125°C Temperature Range
●● 20 or 28 I/O Ports, Each Configurable as
Push-Pull Logic Output
Schmitt Logic Input
Schmitt Logic Input with Internal Pullup
●● 11µA (max) Shutdown Current
●● Logic Transition Detection for Seven I/O Ports
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX7300AAI
-40°C to +125°C 28 SSOP
MAX7300ATI
-40°C to +125°C 28 TQFN-EP*
MAX7300AAX
-40°C to +125°C 36 SSOP
MAX7300ATL
-40°C to +125°C 40 TQFN-EP*
*EP = Exposed pad.
Devices are also available in a lead(Pb)-free/RoHS-compliant
package. Specify lead-free by adding “+” to the part number
when ordering. Devices are also available in tape-and-reel
packaging. Specify tape and reel by adding “T” to the part
number when ordering.
Typical Operating Circuit
3V
47nF
39kΩ
DATA
CLOCK
36 V+
3 GND
2
1
GND
ISET
35 AD1
4 AD0
33 SDA
34 SCL
31 P31
29 P30
27 P29
25 P28
24 P27
23 P26
22 P25
21 P24
MAX7300AAX
P4 32
P5 30
P6 28
P7 26
P8 5
P9 7
P10 9
P11 11
P12 6
P13 8
P14 10
P15 12
P16 13
P17 14
P18 15
P19 16
P20 17
P21 18
P22 19
P23 20
I/O 4
I/O 5
I/O 6
I/O 7
I/O 8
I/O 9
I/O 10
I/O 11
I/O 12
I/O 13
I/O 14
I/O 15
I/O 16
I/O 17
I/O 18
I/O 19
I/O 20
I/O 21
I/O 22
I/O 23
I/O 24
I/O 25
I/O 26
I/O 27
I/O 28
I/O 29
I/O 30
I/O 31
19-2413; Rev 8; 5/14
1 page  
MAX7300
2-Wire-Interfaced, 2.5V to 5.5V,
20-Port or 28-Port I/O Expander
Typical Operating Characteristics (continued)
(RISET = 39kΩ, TA = +25°C, unless otherwise noted.)
GPO SINK CURRENT vs. TEMPERATURE
(OUTPUT = 0)
18
16 VV+ = 2.5V TO 5.5V, VPORT = 0.6V
14
12
10
8
6
4
2
-40.0 -12.5 15.0 42.5 70.0 97.5 125.0
TEMPERATURE (°C)
GPO SOURCE CURRENT vs. TEMPERATURE
(OUTPUT = 1)
9
VPORT = 1.4V
8
VV+ = 5.5V
7
6 VV+ = 3.3V
5 VV+ = 2.5V
4
3
2
-40.0 -12.5 15.0 42.5 70.0 97.5 125.0
TEMPERATURE (°C)
GPI PULLUP CURRENT
vs. TEMPERATURE
1000
GPO SHORT-CIRCUIT CURRENT
vs. TEMPERATURE
100
VV+ = 5.5V
100
VV+ = 3.3V
VV+ = 2.5V
10
-40.0 -12.5 15.0 42.5 70.0 97.5 125.0
TEMPERATURE (°C)
GPO = 0, PORT
SHORTED TO V+
10
GPO = 1, PORT
SHORTED TO GND
1
-40.0 -12.5 15.0 42.5 70.0 97.5 125.0
TEMPERATURE (°C)
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX7300
2-Wire-Interfaced, 2.5V to 5.5V,
20-Port or 28-Port I/O Expander
COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION
ACKNOWLEDGE FROM MAX7300
D15 D14 D13 D12 D11 D10 D9 D8
S
SLAVE ADDRESS
0A
COMMAND BYTE
AP
Figure 7. Command Byte Received
R/W ACKNOWLEDGE FROM MAX7300
HOW COMMAND BYTE AND DATA BYTE MAP INTO MAX7300’s REGISTER
ACKNOWLEDGE FROM MAX7300
ACKNOWLEDGE FROM MAX7300
D15 D14 D13 D12 D11 D10 D9 D8
ACKNOWLEDGE FROM MAX7300
D7 D6 D5 D4 D3 D2 D1 D0
S
SLAVE ADDRESS
0A
COMMAND BYTE
A
DATA BYTE
AP
R/W
Figure 8. Command and Single Data Byte Received
1 BYTE
AUTOINCREMENT MEMORY WORD ADDRESS
tions on that port are to be ignored. Transition detection
works regardless of whether the port being monitored is
set to input or output, but generally, it is not particularly
useful to enable transition detection for outputs.
To use transition detection, first set up the mask register
and configure port P31 as an output, as described above.
Then enable transition detection by setting the M bit in
the configuration register (Table 9). Whenever the config-
uration register is written with the M bit set, the MAX7300
updates an internal 7-bit snapshot register, which holds
the comparison copy of the logic states of ports P24
through P30. The update action occurs regardless of the
previous state of the M bit, so that it is not necessary to
clear the M bit and then set it again to update the snap-
shot register.
When the configuration register is written with the M bit
set, transition detection is enabled and remains enabled
until either the configuration register is written with the
M bit clear, or a transition is detected. The INT status bit
(transition detection mask register bit D7) goes low. Port
P31 (if enabled as INT output) also goes low, if it was not
already low.
Once transition detection is enabled, the MAX7300
continuously compares the snapshot register against
the changing states of P24 through P31. If a change on
any of the monitored ports is detected, even for a short
time (like a pulse), the INT status bit (transition detec-
tion mask register bit D7) is set. Port P31 (if enabled
as INT output) also goes high. The INT output and INT
status bit are not cleared if more changes occur or if the
data pattern returns to its original snapshot condition.
The only way to clear INT is to access (read or write) the
transition detection mask register (Table 10). So if the
transition detection mask register is read twice in succes-
sion after a transition event, the first time reads with bit
D7 set (identifying the event), and the second time reads
with bit D7 clear.
Transition detection is a one-shot event. When INT has
been cleared after responding to a transition event, tran-
sition detection is automatically disabled, even though
the M bit in the configuration register remains set (unless
cleared by the user). Reenable transition detection by
writing the configuration register with the M bit set to take
a new snapshot of the seven ports P24 to P30.
External Component RISET
The MAX7300 uses an external resistor, RISET, to set
internal biasing. Use a resistor value of 39kΩ.
Applications Information
Low-Voltage Operation
The MAX7300 operates down to 2V supply voltage
(although the sourcing and sinking currents are not guar-
anteed), providing that the MAX7300 is powered up ini-
tially to at least 2.5V to trigger the device’s internal reset.
Serial Interface Latency
When a MAX7300 register is written through the I2C
interface, the register is updated on the rising edge of
SCL during the data byte’s acknowledge bit (Figure 5).
The delay from the rising edge of SCL to the internal
register being updated can range from 50ns to 350ns.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX7300AAX.PDF ] | |
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