MAX31911AUI+ Maxim Integrated, MAX31911AUI+ Datasheet - Page 8

• Manufacturer Part Number: MAX31911AUI+
• Description: Serializers & Deserializers - Serdes Octal Industrial Digital Serializer
• Manufacturer: Maxim Integrated
• Type: Serializerr

Specifications of MAX31911AUI+

• Rohs: yes
• Data Rate: 1 Mbit/s
• Input Type: Industrial Digital (IEC 61131-2 Types 1, 2, 3)
• Output Type: CMOS
• Number Of Inputs: 8
• Number Of Outputs: 1
• Operating Supply Voltage: 10 V to 36 V
• Operating Temperature Range: - 40 C to + 125 C
• Package / Case: TSSOP-28
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Part # Aliases: 90-31911+000

The MAX31911 industrial interface serializer inputs
(IN1–IN8) sense the state (on vs. off) of field sen-
sors by monitoring both voltage and current flowing
through the sensor output. The current sinking through
these input pins rises linearly with input voltage until
the limit set by the current clamp is reached. Any volt-
age increase beyond this point does not increase the
input current any further.
The value of the current clamp is adjustable through
an external resistor connected between the RIREF pin
and GND. Pins RT0–RT7 must be connected directly
to GND to provide a return path for the input current.
The voltage and current at the IN1–IN8 input pins are
compared against internally set references to deter-
Maxim Integrated
C1
f
IN1–8
24V
R
R1
INX
Detailed Description
Input Current Clamp
V
IN1–8
RT1–8
CC24V
RIREF
MAX31911
R
REF
MODESEL
GND
5VOUT
FAULT
SOUT
DB0
DB1
CLK
SIN
CS
Industrial, Octal, Digital Input
JUMPERS TO
AND GND
5VOUT
mine whether the sensor is on (logic 1) or off (logic
0). The trip points determining the on/off status of the
sensor satisfy the requirements of IEC 61131-2 Type
1 and 3 switches. The device can also be configured
to work as a Type 2 switch.
A digital glitch filter provides debouncing and filtering
of noisy sensor signals. The time constant of this filter
is programmable from 0ms to 3ms through the DB0
and DB1 pins. See
To provide the digital glitch filter, the device checks
that an input is stable for at least three clock cycles.
The duration of a clock cycle is 1/3 of the selected
debounce time. If the input is not stable for at least
three clock cycles, the input change is not sent to the
internal shift register.
C3
Translator/Serializer
Typical Application Circuit
ISOLATION
Table 1
for debounce settings.
MAX31911
VDD_LOGIC
CLK
CS
SOUT
FAULT
Glitch Filter
8