PRELIMINARY DATA SHEET
MSP 34x7G
XTAL_IN, XTAL_OUT – Crystal Input and Output Pins
(Fig. 4–14)
These pins are connected to an 18.432 MHz crystal
oscillator which is digitally tuned by integrated shunt
capacitances. An external clock can be fed into
XTAL_IN. External capacitors at each crystal pin to
ground (AVSS) are required. It should be verified by
layout, that no supply current for the digital circuitry is
flowing through the ground connection point. To adjust
capacitors see Crystal Recommendations on page 44.
D_CTR_I/O_1/0 – Digital Control Input/Output Pins
(Fig. 4–13)
General purpose input/output pins. Pin D_CTR_I/O_1
can be used as an interrupt request pin to the control-
ler.
ADR_SEL – I2C Bus Address Select (Fig. 4–11)
This pin selects the device address for the MSP (see
Table 3–1 on page 14).
STANDBYQ – Standby
In normal operation, this pin must be high. If the
MSP 34x7G is switched to (‘Standby’-mode), the
SCART switches maintain their position and function
(see Section 2.6.2.on page 13).
* Application Note:
All ground pins should be connected to one low-resis-
tive ground plane. All supply pins should be connected
separately with short and low-resistive lines to the
power supply. Decoupling capacitors from DVSUP to
DVSS, AVSUP to AVSS, and AHVSUP to AHVSS are
recommended as closely as possible to these pins.
Decoupling of DVSUP and DVSS is most important.
We recommend using more than one capacitor. By
choosing different values, the frequency range of
active decoupling can be extended. In our application
boards we use: 220 pF, 470 pF, 1.5 nF, and 10 µF. The
capacitor with the lowest value should be placed near-
est to the DVSUP and DVSS pins.
Micronas
37
MICRONAS [ MICRONAS ]
