UM0842 datasheet(33/50 Pages) STMICROELECTRONICS

33 / 50 page

UM0842

CPU board hardware description

Doc ID 16542 Rev 4

33/50

A.3.3

Jumpers & connectors

The jumpers and connectors numbered below refer to the CPU board schematics (available

from your local ST representative).

Sheet 4

Connector J3 is a standard 20-pin 2.54 mm connector used for JTAG connections.

Jumper J5 enables the power supply to the Real Time Clock block.

If jumper J5 is closed, the RTC is powered (standard).

Connector J10 is a 2 vie 1.25 mm pitch connector for battery back-up with cable.

Sheet 5

Connector J11 is a standard power connector for the ADC power supply with a 2.1-mm

central pitch.

Sheet 6

Jumpers J6, J7, J8 and J9 are serial jumpers for the SPEAr power rail.

All jumpers MUST be closed. This configuration is used for power measurements.

Sheet 7

Jumper J22 is a 4-pin symmetric IDC (or strip) connector that switches RX and TX

signals for different types of RS-232 cables(a):

–

Two pins are connected to the ST3232 Receive/Transmit side.

–

Two pins are connected to the RS-232 Receive/Transmit connector side.

Connector J17 is a connector for standard IDC-to-DSUB converters.

Jumper J20 switches between RS-232 transmit signals or GPIO2:

–

If jumper is on pins 1 and 2, pin PL_GPIO2 is connected to U12 (ST3232) and the

COM0 is available on J17.

–

If jumper is on pins 2 and 3, pin PL_GPIO2 is connected to the expansion

connector J12 pin 9. In this case the COM0 is available on CN13.

Jumper J21 switches between RS-232 receive signals or GPIO3:

–

If jumper is on pins 1 and 2, pin PL_GPIO3 is connected to U12 (ST3232) and the

COM0 is available on J17.

–

If jumper is on pins 2 and 3, pin PL_GPIO3 is connected to the expansion

connector J12 pin 11. In this case the COM0 is available on CN13.

a. With 2 jumpers (inserted) the user can switch between two cases; two jumper inserted "vertically" or two

jumpers inserted "horizontally". This enables the user to adapt the serial cable (null modem cable) to the CPU

board. See Figure 26: Serial cable setting.

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