EMDB65xx

Copyright © 2005, EM Microelectronic-Marin SA

7

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7.

SIGNALS NOTES

7.1 VDD

Several jumpers are used

to allow different configurations (run / prog. mode / current meas.).

Capacitor 100nF (decoupling) is placed as close as possible to MCU.

A 47uF capacitor is also used with jumper. It allow to power the application only with this capacitor.

Figure 5: VDD selection

7.2 RESET

Weak pull-down is added. With push-button to force internal reset and available on external

connection (only footprint).

Figure 6: Reset connection

7.3 VSS

Common ground

7.4 TEST

Weak pull-down can be added(only footprint).

7.5 QIN / SDIO AND QOUT/SCLK

A 32768Hz Xtal has to be connected as close as possible to MCU. Near each MCU footprint, a Xtal

footprint is placed. 2 footprints 0805 are present (just in case) for optional Xtal capacitor.

Figure 7: Xtal connections

7.6 VREG AND VREG/VPP

A 100nF is placed between VREG and VSS.

E M 6 5 x x

Q IN

Q O U T

G N D

G N D

EM65xx

RESET

1

0

0

K

GND

VDD

S1

RESET_EXT

RESET_PROG

VDD_APPLI

VDD_MCU

47u

100n

VDD_BAT

VDD_EXT

VDD_PROG

JP12 (3-4)

JP12 (1-2)

JP13

JP14