S-7760A Datasheet, PDF (6/53 Pages) Seiko Instruments Inc – PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E²PROM CIRCUIT)
S-7760A
Rev.1.3_00
WP
Figure 8 WP Pin
VCCL
VCCL
DO
Figure 9 DO Pin
„ Option Regarding High/Low Leveled Input Voltage for Pin
For the SDA, SCL and TIMEN pins, the two types of high/low leveled input voltage are selectable by option.
1. CMOS input type
The high/low leveled input voltage varies according to the power supply voltage.
The value is defined by the rate for power supply voltage as; V_IH ≥ 0.7 × V_CCH by high leveled input voltage, V_IL ≤ 0.3 ×
V_CCH by low leveled input voltage.
2. Low voltage input type
This option is effective when the power supply voltage at MPU is lower than the one of the S-7760A.
If using this option, setting a level-shifter for an interface signal is unnecessary.
Independent of the power supply voltage, the high/low leveled input voltage is constant, moreover, the value is also
constant unlike the definition by the rate as; V_IH ≥ 1.5 V by high leveled input voltage, V_IL ≤ 0.3 V by low leveled input
voltage.
The TIMEN pin is able to set as the RESX pin by option, however, also in this case the types regarding high/low leveled
input voltage are selectable.
6
Seiko Instruments Inc.