Features and Benefits
- 2MHz SCK Over 10m, Operation Up to 1200m
- Three Extended Slave Selects
- Protected from Overvoltage Lines Fault to ±60V
- ±40kV HBM ESD on Link Pins
- IEC ESD ±6kV and EFT ±4kV on Link Pins
- Extended Common Mode Range: ±25V
- Extended Interrupt
- Separate Programmable SPI Modes
- 3V to 5.5V Supply Voltage
- 1.62V to 5.5V Logic Supply
- 4mm × 5mm 20-Lead QFN Package
The LTC4332 is a point-to-point rugged SPI extender designed for operation in high noise industrial environments over long distances. Using a ±60V fault protected differential transceiver, the LTC4332 can transmit SPI data, including an interrupt signal, up to 2MHz over two twisted pair cables. The extended common mode range and high common mode rejection on the differential link provides tolerance to large ground differences between nodes.
The LTC4332 provides a control interface using a separate slave select for configuration and fault monitoring.
- Industrial Control and Sensors
- Lighting and Sound System Control
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Demonstration circuit 2799A uses the LTC4332 to extend a SPI interface with 3 slave devices to up to 1200m (150m with a 500kHz SCK as factory configured). The DC2799A is designed to be compatible with the popular Pmod interface to allow for easy evaluation with the many master and slave devices in this ecosystem.
The LTC4332 is a 2MHz SPI bus extender designed for operation in high noise industrial environments. The SPI bus is extended over two twisted pairs by ±60V fault protected differential transceivers. The LTC4332’s extended 25V common mode voltage range allows it to bridge across different ground potentials.
The DC2799A’s local side interfaces with the host SPI master as 4 different SPI slave devices. These slave devices support SPI modes (0,0) or (1,1) where (CPOL, CPHA). Three of the slave devices are associated with the remote side devices (SS1, SS2, SS3) and the fourth device (SSC) is used to configure the DC2799A’s LTC4332 SPI extenders. The DC2799A’s remote side interface implements a SPI master with 3 different slave selects. The remote side master supports all four SPI modes and a unique mode may be associated to each slave select.
By default, the remote SPI modes are all mode (0,0). The remote side SPI modes are configured by writing to the local side LTC4332 using the SSC slave device.
The LTC4332 data sheet gives a complete description of the part, its operation and application information. The data sheet should be referred to when reading this demo manual. The LTC4332 is available in a 20-lead QFN package and three temperature grades (commercial 0°C to 70°C, industrial –40°C to 85°C, and high temperature –40°C to 125°C).
Tools & Simulations
3rd Party Solutions (1)
Product Selector Card (2)
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Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.