Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

X1228 Datasheet(PDF) 3 Page - Intersil Corporation

Part No. X1228
Description  Real Time Clock/Calendar/CPU Supervisor with EEPROM
Download  29 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

X1228 Datasheet(HTML) 3 Page - Intersil Corporation

  X1228 Datasheet HTML 1Page - Intersil Corporation X1228 Datasheet HTML 2Page - Intersil Corporation X1228 Datasheet HTML 3Page - Intersil Corporation X1228 Datasheet HTML 4Page - Intersil Corporation X1228 Datasheet HTML 5Page - Intersil Corporation X1228 Datasheet HTML 6Page - Intersil Corporation X1228 Datasheet HTML 7Page - Intersil Corporation X1228 Datasheet HTML 8Page - Intersil Corporation X1228 Datasheet HTML 9Page - Intersil Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 3 / 29 page
background image
3
FN8100.2
October 17, 2005
PIN DESCRIPTIONS
PIN ASSIGNMENTS
Pin Number
SOIC/TSSOP
Symbol
Brief Description
1X1
X1. The X1 pin is the input of an inverting amplifier. An external 32.768kHz quartz crystal
is used with the X1228 to supply a timebase for the real time clock. The recommended crystal
is a Citizen CFS206-32.768KDZF. Internal compensation circuitry is included to form a
complete oscillator circuit. Care should be taken in the placement of the crystal and the layout
of the circuit. Plenty of ground plane around the device and short traces to X1 are highly
recommended. See Application section for more recommendations.
2X2
X2. The X2 pin is the output of an inverting amplifier. An external 32.768kHz quartz crystal
is used with the X1228 to supply a timebase for the real time clock. The recommended crystal
is a Citizen CFS206-32.768KDZF. Internal compensation circuitry is included to form a
complete oscillator circuit. Care should be taken in the placement of the crystal and the layout
of the circuit. Plenty of ground plane around the device and short traces to X2 are highly
recommended. See Application section for more recommendations.
6
RESET
RESET Output – RESET. This is a reset signal output. This signal notifies a host
processor that the watchdog time period has expired or that the voltage has dropped below
a fixed VTRIP threshold. It is an open drain active LOW output. Recommended value for the
pullup resistor is 5k
Ω. If unused, tie to ground.
7VSS
VSS.
8SDA
Serial Data (SDA). SDA is a bidirectional pin used to transfer data into and out of the
device. It has an open drain output and may be wire ORed with other open drain or open
collector outputs. The input buffer is always active (not gated).
An open drain output requires the use of a pull-up resistor. The output circuitry controls the
fall time of the output signal with the use of a slope controlled pull-down. The circuit is
designed for 400kHz 2-wire interface speeds.
9SCL
Serial Clock (SCL). The SCL input is used to clock all data into and out of the device. The
input buffer on this pin is always active (not gated).
12
PHZ/IRQ
Programmable Frequency/Interrupt Output – PHZ/IRQ. This is either an output from the
internal oscillator or an interrupt signal output. It is a CMOS output.
When used as frequency output, this signal has a frequency of 32.768kHz, 4096Hz, 1Hz
or inactive.
When used as interrupt output, this signal notifies a host processor that an alarm has
occurred and an action is required. It is an active LOW output.
The control bits for this function are FO1 and FO0 and are found in address 0011h of the
Clock Control Memory map. See “Programmable Frequency Output Bits—FO1, FO0” on
page 14.
13
VBACK
VBACK. This input provides a backup supply voltage to the device. VBACK supplies power
to the device in the event the VCC supply fails. This pin can be connected to a battery, a
Supercap or tied to ground if not used.
14
VCC
VCC.
NC = No internal connection
NC
NC
X1
X2
1
2
3
4
13
14
12
11
14 Ld TSSOP/SOIC
5
6
7
10
9
8
RESET
VSS
VCC
VBACK
PHZ/IRQ
NC
SCL
NC
SDA
NC
X1228


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29 


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn