pcf2128 NXP Semiconductors, pcf2128 Datasheet - Page 4

• Manufacturer Part Number: pcf2128
• Description: Integrated Rtc / Tcxo / Crystal
• Manufacturer: NXP Semiconductors

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