SN65HVS885_15 Datasheet, PDF (1/28 Pages) Texas Instruments – 34-V Digital-Input Serializer

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SN65HVS885
SLAS638A – JANUARY 2009 – REVISED OCTOBER 2015
SN65HVS885 34-V Digital-Input Serializer for 5-V Systems
1 Features
•1 Eight Digital Sensor Inputs
– High Input Voltage up to 34 V
– Selectable Debounce Filters From 0 ms to
3 ms
– Flexible Input Current-Limited – 0.2 mA to 5.2
mA
– Field Inputs Protected to 15-kV ESD
• Single 5-V Supply
• Output Drivers for External Status LEDs
• Cascadable for More Inputs in Multiples of Eight
• SPI-Compatible Interface
• Overtemperature Indicator
2 Applications
• Industrial PCs
• Digital I/O Cards
• High Channel Count Digital Input Modules
• Decentralized I/O Modules
3 Description
The SN65HVS885 is an eight channel, digital-input
serializer for high-channel density digital input
modules in industrial and building automation.
Operating from a 5-V supply the device accepts field
input voltages of up to 34 V. In combination with
galvanic isolators the device completes the interface
between the high voltage signals on the field-side and
the low-voltage signals on the controller side. Inputs
signals are current limited and then validated by
internal debounce filters.
With the addition of few external components, the
input switching characteristic can be configured in
accordance with IEC61131-2 for Type 1, 2 and 3
sensor switches.
Upon the application of load and clock signals, input
data is latched in parallel into the shift register and
afterwards clocked out serially.
Cascading of multiple devices is possible by
connecting the serial output of the leading device with
the serial input of the following device, enabling the
design of high-channel count input modules. Multiple
devices can be cascaded through a single serial port,
reducing both the isolation channels and controller
inputs required.
Input status can be visually indicated via constant
current LED outputs. The current limit on the inputs is
set by a single, external, precision resistor. An on-
chip temperature sensor provides diagnostic
information for graceful shutdown and system safety.
The SN65HVS885 is available in a 28-pin PWP
PowerPAD™ package, allowing for efficient heat
dissipation. The device is specified for operation at
temperatures from –40°C to 125°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SN65HVS885
HTSSOP (28)
9.70 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified I/O Structure
Debounce Select 2
DB 0:1
Serial Input
Field Inputs 8
IP 0:7
GND
8
LED Outputs 8
RE 0:7
I_REF Adjust:
RLIM
3 Control Inp[uts
LD, CE, CLK
V_CC
Serial Output
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.