UPD16675AP datasheet(28/36 Pages) NEC

28 / 36 page

µµµµPD16675A

Switching Characteristics

(Unless otherwise specified, TA =

−−−−40 to ++++85°°°°C, VDD1 = 2.7 to 3.3 V, VCHA = H: VDD2 = 2.7 to 3.6 V or VCHA = L:

VDD2 = 2.7 to 5.5 V)

Parameter

Symbol

Condition

MIN.

TYP.

MAX.

Unit

Oscillation frequency

fOSC

Self-oscillation

kHz

Transfer delay time

tPHL

SCK

↓→DATA↓

100

tPLH

SCK

↓→DATA↑

300

Remark The TYP. value is a reference value when TA = 25

°C.

The time for one frame is obtained with the following formula.

1 frame = 1/fOSC

× 8 × number of duties

If fOSC = 30 kHz and 1/34 duty, then the result is:

1 frame = 33

µs × 8 × 34 = 9.1 ms

Required Conditions for Timing

(Unless otherwise specified, TA =

−−−−40 to ++++85°°°°C, VDD1 = 2.7 to 3.3 V, VCHA = H: VDD2 = 2.7 to 3.6 V or VCHA = L:

VDD2 = 2.7 to 5.5 V)

(1) Common

Parameter

Symbol

Condition

MIN.

TYP.

MAX.

Unit

Clock frequency

fOSC

OSCIN external clock

kHz

High level clock pulse width

tWHC1

OSCIN external clock

µs

Low level clock pulse width

tWLC1

OSCIN external clock

µs

High level clock pulse width

tWHC2

OSCBRI external clock

400

Low level clock pulse width

tWLC2

OSCBRI external clock

400

Rise/fall time

tr, tf

OSCBRI external clock

100

Reset pulse width

tWRE

Reset pin

1.0

µs

Remark The TYP. value is a reference value when TA = 25

°C.

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