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PCF2128 Datasheet(PDF) 4 Page - NXP Semiconductors

Part # PCF2128
Description  Integrated RTC / TCXO / Crystal
PDF  10 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF2128 Datasheet(HTML) 4 Page - NXP Semiconductors

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PCF2128_SDS_0
© NXP B.V. 2007. All rights reserved.
Preliminary [short] data sheet
Rev. 00.03 — 4 June 2007
4 of 10
NXP Semiconductors
PCF2128
Real time clock / calendar
6.
Pinning information
6.1 Pinning
Fig 2.
Pin configuration SO20
Fig 3.
SO20 (3d)
PCF2128
SCL
VDD
SDI
VBAT
SDO
VOUT
SDA/CE
INT
IFS
RST
TS
PFI
CLKOUT
PFO
VSS
TEST
n.c.
n.c.
n.c.
n.c.
001aag060
1
2
3
4
5
6
7
8
9
10
12
11
14
13
16
15
18
17
20
19
001aag576
die
oscillator
Table 3:
Pin description PCF2128
Symbol
Pin
Description
Symbol
Pin
Description
SCL
1
combined serial clock input for both I2C
and SPI interface. May float when CE
inactive.
VDD
20
positive supply voltage
SDI
2
serial data input for SPI interface. May
float when CE inactive.
VBAT
19
battery backup supply voltage
SDO
3
serial data output for SPI interface,
push-pull
VOUT
18
battery backed output voltage
SDA / CE
4
combined serial data input / output for the
I2C interface and chip enable input (active
LOW) for the SPI interface.
INT
17
interrupt output (open-drain; active
LOW)
IFS
5
interface selector input
• connect to ground to select the SPI
interface
• connect to VOUT (pin 18) to select the
I2C interface
RST
16
reset output (open drain; active LOW)
TS
6
timestamp input (active LOW) with 200 k
Ω
internal pull-up resistor
PFI
15
power fail input
CLKOUT
7
clock output (open drain)
PFO
14
power fail output (open drain; active
LOW)
VSS
8
ground
TEST
13
Do not connect and do not use as feed
through.
nc
9
Do not connect and do not use as feed
through.
nc
12
Do not connect and do not use as feed
through.
nc
10
Do not connect and do not use as feed
through.
nc
11
Do not connect and do not use as feed
through.



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