Overview
The ST7540 is a Half Duplex synchronous/asynchronous Frequency Shift Keying (FSK) Modem designed for power line communication network applications. It operates from a single supply voltage and integrates a power line driver and two linear regulators for 5V and 3.3V. The device is realized in Multipower BCD5 technology, allowing the integration of DMOS, Bipolar, and CMOS structures in the same chip. It is packaged in a HTSSOP28 Exposed Pad configuration.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Power Supply Voltage (VCC) | 7.5 to 13.5 | V |
| Digital Supply Voltage (VDD) | 4.75 to 5.25 | V |
| Power Supply Current (TX mode) | 60 mA (rms) | mArms |
| Power Supply Current (RX mode) | 5 mA (rms) | mArms |
| Digital Input Supply Current | 3.5 mA (Transmission & Receiving mode, MCLK = 4MHz) | mA |
| Under Voltage Lock Out (UVLO) Threshold | 3.7 to 4.1 | V |
| UVLO Hysteresis | 340 mV | mV |
| Internal Pull Down Resistor | 100 kΩ (typ) | kΩ |
| Internal Pull Up Resistor | 100 kΩ (typ) | kΩ |
| High Logic Level Input Voltage (5V supply) | 2 V | V |
| Low Logic Level Input Voltage (5V supply) | 1.2 V | V |
| High Logic Level Output Voltage (5V supply) | VDD - 0.45 V | V |
| Low Logic Level Output Voltage (5V supply) | GND + 0.3 V | V |
| Baud Rate | 600, 1200, 2400, 4800 BPS | BPS |
| Receiving Sensitivity | Up to 250 µVRMS | µVRMS |
| Carrier Detection Sensitivity | Up to 250 µVRMS | µVRMS |
Key Features
- Half-duplex FSK transceiver
- Integrated power line driver with programmable voltage and current control
- Programmable mains access: synchronous and asynchronous
- Single supply voltage (7.5V to 13.5V)
- Very low power consumption (Iq = 5mA)
- Integrates 5V and 3.3V voltage regulators with short circuit protection
- 8 programmable transmission frequencies
- Programmable baud rate up to 4800 BPS
- Carrier or preamble detection
- Band in use detection
- Programmable control register
- Watchdog timer
- 8 or 16 Bit header recognition
- UART/SPI host interface
Applications
The ST7540 is suitable for various power line communication network applications, including those that need to comply with the EN 50065 Cenelec specification. It is particularly useful in smart home automation, industrial control systems, and other applications where reliable and efficient power line communication is required.
Q & A
- What is the primary function of the ST7540?
The ST7540 is a Half Duplex synchronous/asynchronous FSK Modem designed for power line communication network applications. - What is the power supply voltage range for the ST7540?
The power supply voltage range is from 7.5V to 13.5V. - What are the available baud rates for the ST7540?
The baud rates available are 600, 1200, 2400, and 4800 BPS. - Does the ST7540 support both synchronous and asynchronous mains access?
Yes, the ST7540 supports both synchronous and asynchronous mains access. - What is the receiving sensitivity of the ST7540?
The receiving sensitivity is up to 250 µVRMS. - Does the ST7540 have integrated voltage regulators?
Yes, it integrates 5V and 3.3V voltage regulators with short circuit protection. - What interfaces does the ST7540 support for host communication?
The ST7540 supports both SPI and UART interfaces. - How is the interface type selected on the ST7540?
The interface type is selected through the UART/SPI pin; setting it to “0” selects SPI, and setting it to “1” selects UART. - What is the purpose of the watchdog timer in the ST7540?
The watchdog timer is used to monitor the system and reset it if it fails to respond within a specified time period. - What package type is the ST7540 available in?
The ST7540 is available in a HTSSOP28 Exposed Pad package.
