Daughter Board Design Guide; Daughter Board Dimensions; Daughter Board Power Supply - Renesas SH7727 General Information Manual

T-engine development kit, hardware volume

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R0P7727TH003TRKE General Information Manual

9. Daughter Board Design Guide

This chapter describes the design of the daughter board to be connected to the expansion slot of T-Engine.

The daughter board may contain user-specific devices and can be controlled by the address bus, data bus,

and control signals or serial signals (start-stop) of the SH7727 that connect to the expansion slots of T-Engine.

The recommended daughter board size is the CPU board size (120mm x 75mm) of T-Engine.

Table 9.1 shows the voltage and current that can be supplied from T-Engine to a daughter board. When a

daughter board requires more current, a power supply must be mounted on the daughter board.

Expansion slot

signal name

3.3V

3.3VSB

The permissible current shown in Table 9.1 is the sum of permissible currents for 3.3V and 3.3VSB.

When a peripheral device operating on the bus power via the USB has been connected to T-Engine or

the PCMCIA card is in use, the permissible current is the current obtained by subtracting the dissipation

current of the device and card from the permissible current. For example, when power supply to the

PCMCIA card is 5V/100mA, the permissible current of the expansion slot for 5V is 150mA (250mA to

100mA). For details, refer to Table 1.3 "Permissible Current Supply to the Outside by T-Engine Supply

Voltages."

Table 9.1 Voltage and Current to the Daughter Board

Output voltage

Permissible

current

3.3V

250mA

Remarks

3.3V: Supplied when the SH7727 is turned ON.

3.3VSB: Always supplied when the AC adapter is connected.

Supplied when the SH7727 is turned ON.

CAUTION

Daughter Board Design Guide

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