SM3470BB

SEIKO NPC CORPORATION - 11

Power-ON Timing

When power is applied, the settings written in EEPROM and the adjustment data are automatically transferred to the register. During this

interval, the outputs are disabled (Hi-Z). If there is a discrepancy between the data written to the resister and the EEPROM data after data

verification, the EEPROM settings are automatically transferred again and then the outputs are enabled if the data matches. The automatic

transfer time is 200µs or less. During this interval, the VPP terminal should be left open. If a voltage is applied to VPP, the automatic

transfer of settings is aborted.

Serial Interface

The IC has a built-in EEPROM for the register for the analog circuit adjustment and operating mode settings, and for data retention. The

EEPROM is accessed using a 3-wire serial interface.

The CE, CLK, and DATA signal inputs are used only when writing and reading data, and should not be modified at other times to prevent

incorrect operation.

The serial interface is disabled during the interval while the settings are automatically transferred from EEPROM to the register after power

is applied.

Data Format

* The read and write data are not guaranteed if there are too many or too few CLK pulses.

* The operating mode setting is ignored when writing to EEPROM. The mode is set when writing to the register.

VDD

EEPROM

Function

EEPROM

ALL-DATA READ

DATA

Verify

Output

(DA,DB,DZ)

Output enable

Output disable

Hi-Z

OK

NG

Power On Reset release

R/W

R/E

A2

A1

A0

D5

D4

D3

D2

D1

D0

CE

CLK

DATA

Data

Address

Access destination: Register/EEPROM

Read/Write

D7

D6

D8

12

34

5

6

78

9

10

11

12

13

14

15

16

L: Read

H: Write

L: Register

H: EEPROM