CF5705 datasheet(6/7 Pages) NPC

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CF5705 series

NIPPON PRECISION CIRCUITS—6

Test Function

Normal mode (TEST = open circuit)

In test mode, a 512 Hz rectangular wave is output on

TEST. Note that the output load (probe) must be

greater than 10 M

Ω and less than 20 pF. The motor

drive outputs on OUT1 and OUT2 continue to oper-

ate normally.

Test mode 1 (TEST = VDD)

Test mode 1 is invoked when TEST is held HIGH for

a minimum of 2 cycles of the 512 Hz clock

(TCH > 3.9 ms), otherwise it is ignored. In test mode

1, high-speed motor output operation occurs, with

the cycle time set by mask option to 62.5 or 125 ms.

Test mode 2 (TEST = VSS)

Test mode 2 is a dedicated IC test mode. In test mode

2, the device operates at 32-times speed, with the

supply voltage connected directly to the oscillator

circuit. Note that if a reset input occurs, the internal

operation is reset and device output stops. Once

operation stops, normal operation is not restored

until TEST is either open circuit or goes LOW.

OUT1

OUT2

TPW

TCY/2

VDD

VSS

TPW

TCY/2

VDD

VSS

tCY/2 tCY/2

TPW

T < Tch

T > Tch

VDD

VSS

TEST

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