Epson RX-8564LC ∆ fT, (2-2)Current consumption when non-accessed(ii), (2) Current and voltage consumption characteristics

RX − 8564 LC

9.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]

[ 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 temperature
! α	[ 1 / ° C2 ]	: 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(Sec)

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

(2) Current and voltage consumption characteristics

(2-1) Current consumption when non-accessed (i) when CLKOUT=OFF

Condition :

fSCL=0 Hz, Ta=+25 ° C, CLKOUT=OFF

1.0

consumption [∝ A]	0.5	IDD[∝ A]
Current

2 3 4 5

Supply Voltage VDD[V]

(2-2) Current consumption when non-accessed (ii)

when CLKOUT=32.768kHz

Condition :

fSCL=0 Hz, Ta=+25 ° C, CLKOUT=32.768 kHz

10

A]	CL=30 pF
[∝
consumption	5
Current
	IDD32K[∝ A]
	CL=0 pF

2 3 4 5

Supply Voltage VDD[V]

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