FX803 Datasheet, PDF (2/17 Pages) Sanyo Semicon Device – DC-DC Converter

Pin Number Function
J/LG/LS DW
1
1
Xtal: The output of the on-chip clock oscillator. External components are required at this input when a
Xtal input is used. See Figure 2.
2
2
Xtal/Clock: The input to the on-chip clock oscillator inverter. A Xtal or externally derived clock (f )
XTAL
should be connected here. See Figure 2.
3
3
Reply Data: The “C-BUS” serial data output to the µController. The transmission of Reply Data bytes
is synchronized to the Serial Clock under the control of the Chip Select input. This 3-state output is held
at high-impedance when not sending data to the µController. See Timing Diagrams.
4
5
Chip Select (CS): The “C-BUS” data loading control function. This input is provided by the µController.
Data transfer sequences are initiated, completed or aborted by the CS signal. See Timing Diagram.
5
6
Command Data: The “C-BUS” serial data input from the µController. Data is loaded to this device in
8-bit bytes, MSB (B7) first, and LSB (B0) last, synchronized to the Serial Clock. See Timing Diagrams.
6
7
Logic Input: This ‘real-time’ input is available as a general purpose logic input port which can be read
from the Status Register. See Table 3.
7
8
Interrupt Request (IRQ): The output of this pin indicates an interrupt condition to the µController, by
going to a logic “0.” This is a “wire-or able” output, allowing the connection of up to 8 peripherals to 1
interrupt port on the µController. This pin has a low-impedance pulldown to logic “0” when active and a
high-impedance when inactive. The System IRQ line requires one pullup resistor to V .
DD
The conditions that cause interrupts are indicated in the Status Register and are shown below:
G/Purpose Timer Period Expired
NOTONE Timer Period Expired
Rx Tone Measurement Complete
These interrupts are inactive during relevant Powersave conditions and can be disabled by Bits 5 and 6
in the Control Register.
8
4
No internal connection, connect to V .
SS
9
9
No internal connection, connect to V_SS.
10
10
Audio Switch In: The input to the stand-alone, on-chip Audio Switch. This switching function (Control
Register Bit 7) may be used to break the system transmitter modulation path when it is required to
provide a CUE (beep) from Tone Generator 2 to the loudspeaker via the FX806 PLMR Audio
Processor.
11
11
Audio Switch Out: The output of the stand-alone, on-chip Audio Switch.
12
12
V : Negative Supply (Signal Ground).
SS
2