S1F76540 Series

Voltage Converter

The voltage converter, consisting of a boost control circuit and a voltage converter circuit, receives clocks from the clock generator circuit and boosts the input power voltage (VI) four, three or two times. During four-time boosting, however, the three-time and two-

time boost outputs cannot be obtained simultaneously. Figure 2.4 gives the potential relationship during four-, three- and two-time boosting. The C2P pin is also used as the master clock output during parallel connection.

Figure 2.4 Electrical potentials during boosting (at –5V input)

VDD

(0 V)

 

 

 

 

 

VI

 

 

 

 

 

(–5 V)

10 V

 

 

 

 

 

 

 

 

 

 

–10 V

Two-time

 

 

 

 

 

 

 

 

 

boosting

 

15 V

 

 

 

 

 

 

 

 

–15 V

 

 

Three-time

 

 

 

 

 

20 V

 

 

boosting

 

 

 

 

 

 

–20 V

 

 

 

 

 

Four-time boosting

Caution:

•When connecting a capacitor to the C1P, C2P, C1N, C2N, C3N, or VO pin for voltage conversion, close the capacitor to the IC package as much as possible to minimize the wiring length.

2–24

EPSON

S1F70000 Series Technical Manual