PCF25GA datasheet(7/63 Pages) NXP

Part #	PCF25GA

Description	SPI Real time clock/calendar Time keeping application

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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PCF2123

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Product data sheet

Rev. 5 — 27 April 2011

7 of 63

NXP Semiconductors

PCF2123

SPI Real time clock/calendar

8.1.2 Power consumptions with respect to timer mode

Four source clocks are possible for the timer. The 4.096 kHz source clock will add the

greatest part to the power consumption. The selection of 64 Hz, 1 Hz, or 1

⁄

60 Hz will be

almost indistinguishable and add very little.

Configuration: CLKOUT disabled, VDD = 3 V, timer clock set to 1⁄60 Hz.

(1) IDD (nA) minimum power mode.

(2) Maximum value for RS is 100 kΩ.

Fig 5.

IDD with respect to quartz RS

Rs(2) (k

Ω)

0

100

80

40

60

20

001aai558

130

170

90

210

250

IDD(1)

(nA)

50

Configuration: CLKOUT disabled, quartz RS =15kΩ.

(1) IDD (nA) minimum power mode.

(2) Timer clock = 4 kHz.

(3) Timer clock = 64 Hz, 1 Hz, 1

⁄

60 Hz.

Fig 6.

IDD with respect to timer clock selection

VDD (V)

0

6

4

2

001aai559

200

100

300

400

IDD(1)

(nA)

0

(2)

(3)

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PCF25GA Datasheet(PDF) 7 Page - NXP Semiconductors

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