ST7MDT20-EVC/US STMicroelectronics, ST7MDT20-EVC/US Datasheet - Page 12

• Manufacturer Part Number: ST7MDT20-EVC/US
• Description: BOARD EVALUATION/TRAINING/PROGRM
• Manufacturer: STMicroelectronics

Specifications of ST7MDT20-EVC/US

• Module/board Type: Evaluation Board
• For Use With/related Products: ST72124,7231x,72321,72334,72511,72512,72521
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-2897

ST7 MDT20 EVAL BOARD DESCRIPTION
1.4 OSCILLATION SYSTEM
The ST7MDT20 Eval Board is designed to be used with an on-board 16-MHz crystal. But an-
other clock signal can be used by connecting the corresponding oscillator to the OSCIN pin.
To do this, remove jumper J4 and connect the external clock signal generator to the OSCIN
pin as shown in
Figure 3.
Figure 3. How to Change the Oscillator Frequency
From external generator
XT1
XT1
16 MHz
16 MHz
J4
J4
1 - Remove jumper J4.
2 - Connect the external clock signal.
MDT20 Eval Board
MDT20 Eval Board
1.5 CAN DEVICE COMMUNICATION
A CAN transceiver (L9615 or U435) is connected to the microcontroller CAN pin (pins PE2
and PE3). In order to supply power to the CAN transceiver, the “APPLI VDD” jumper must be
connected to the W5 connector.
The Rx_CAN pin of the MCU can be disconnected from the transceiver by removing jumper
J12 and the CAN speed is selected according to the configuration of jumper W4. A 120-ohm
terminating resistor is validated when jumper J13 is connected.
1.6 SPI SERIAL COMMUNICATION
An external EEPROM memory with an SPI serial interface is connected to the SPI pins of the
ST7 socket as shown in the following figure. But the serial EEPROM can be disconnected and
the SPI bus used for other communications. This hardware configuration is explained in Appli-
cation Note AN970 “SPI Communication Between ST7 and E2PROM”.
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