Epson RX-8581JE, RX-8581NB, RX-8581SA manual 30

RX - 8581 SA / JE / NB

10. Reference Data

(1) Example of frequency and temperature characteristics

⋅ 10-6	θ T = +25	° C Typ.
	α = -0.035	⋅ 10-6Typ.
0

∆ fT	-50
Frequency
	-100
	-150
	-50	0	+50	+100

Temperature [° C]

(2) Example of frequency and voltage characteristics

			Condition :
		+ 3	3 V as reference, Ta=+25 ° C
∆ fv	⋅10
Frequency
	6 −
		0
		- 3
		2	3	4	5
		Supply Voltage VDD[V]

(3) Current and voltage consumption characteristics

(3-1) Current consumption when non-accessed (i) when FOUT=OFF

	Condition :
1.0	Ta = +25 ° C
	fSCL = 0 Hz
∝A]	FOE = GND, /INT = VDD
	FOUT ; Output OFF
consumption [
0.5
Current

2 3 4 5

Supply Voltage VDD[V]

[Finding the frequency stability]

1.Frequency and temperature characteristics can be approximated using the following equations.

∆fT = α (θ T - θ X)2

∆ fT		: Frequency deviation in any
	(1 / ° C2)	temperature
α		: Coefficient of secondary temperature
		(− 0.035± 0.005) ⋅ 10-6 / ° C2
θ T	(° C)	: Ultimate temperature (+25± 5 ° C)
θ X	(° C)	: Any temperature

2.To determine overall clock accuracy, add the frequency precision and voltage characteristics.

∆ f/f =	∆ f/fo + ∆ fT + ∆ fV
∆ f/f	: Clock accuracy (stable frequency) in any
	temperature and voltage

∆f/fo : Frequency precision

∆fT : Frequency deviation in any temperature

∆fV : Frequency deviation in any voltage

3.How to find the date difference

Date difference = ∆ f/f ⋅ 86400 (seconds)

* For example: ∆ f/f = 11.574 ⋅ 10-6is an error of approximately 1 second/day.

(3-2) Current consumption when non-accessed (ii) when FOUT=32.768 kHz

		Condition :
	10	Ta = +25 ° C
		fSCL = 0 Hz
A]		FOE, /INT = VDD
		FOUT ; 32.768 kHz output ON
[∝
consumption					CL=30 pF
Current	5
					CL=0 pF
		2	3	4	5
		Supply Voltage VDD[V]

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