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PDF ( 数据手册 , 数据表 ) X1227

零件编号 X1227
描述 RTC Real TimeClock/Calendar/ CPU Supervisor
制造商 Intersil Corporation
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X1227 数据手册, 描述, 功能
® NOT RDENaSCtEaEOWESMDhIMSEeELeS1NtIG2D0NE2SD7 FOR
May 8, 2006
X1227
FN8099.2
2-WireRTC Real TimeClock/Calendar/
CPU Supervisor with EEPROM
FEATURES
• Real Time Clock/Calendar
— Tracks Time in Hours, Minutes, and Seconds
— Day of the Week, Day, Month, and Year
• 2 Polled Alarms (Non-volatile)
— Settable on the Second, Minute, Hour, Day of the
Week, Day, or Month
— Repeat Mode (periodic interrupts)
• Oscillator Compensation on Chip
— Internal Feedback Resistor and Compensation
Capacitors
— 64 Position Digitally Controlled Trim Capacitor
— 6 Digital Frequency Adjustment Settings to ±30ppm
• CPU Supervisor Functions
— Power-On Reset, Low Voltage Sense
— Watchdog Timer (SW Selectable: 0.25s, 0.75s,
1.75s, off)
• Battery Switch or Super Cap Input
• 512 x 8 Bits of EEPROM
— 64-Byte Page Write Mode
— 8 Modes of Block Lock™ Protection
— Single Byte Write Capability
• High Reliability
www.DataSheet4U.com — Data Retention: 100 Years
— Endurance: 100,000 Cycles Per Byte
• 2-Wire™ Interface Interoperable with I2C*
— 400kHz Data Transfer Rate
• Low Power CMOS
— 1.25µA Operating Current (Typical)
• Small Package Options
— 8 Ld SOIC and 8 Ld TSSOP
• Repetitive Alarms
• Temperature Compensation
• Pb-Free Plus Anneal Available (RoHS Compliant)
APPLICATIONS
• Utility Meters
• HVAC Equipment
• Audio/Video Components
• Set Top Box/Television
• Modems
• Network Routers, Hubs, Switches, Bridges
• Cellular Infrastructure Equipment
• Fixed Broadband Wireless Equipment
• Pagers/PDA
• POS Equipment
• Test Meters/Fixtures
• Office Automation (Copiers, Fax)
• Home Appliances
• Computer Products
• Other Industrial/Medical/Automotive
DESCRIPTION
The X1227 device is a Real Time Clock with
clock/calendar, two polled alarms with integrated 512x8
EEPROM, oscillator compensation, CPU Supervisor
(POR/LVS and WDT) and battery backup switch.
The oscillator uses an external, low-cost 32.768kHz
crystal. All compensation and trim components are
integrated on the chip. This eliminates several external
discrete components and a trim capacitor, saving
board area and component cost.
BLOCK DIAGRAM
OSC
Compensation
32.768kHz
X1
X2
Oscillator
Frequency 1Hz
Divider
Timer
Calendar
Logic
Time
Keeping
Registers
(SRAM)
Battery
Switch
Circuitry
VCC
VBACK
SCL
SDA
Serial
Interface
Decoder
RESET
Control
Decode
Logic
8
Control/
Registers
(EEPROM)
Status
Registers
(SRAM)
Alarm
Watchdog
Timer
Low Voltage
Reset
Compare
Alarm Regs
(EEPROM)
4K
EEPROM
ARRAY
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005-2006. All Rights Reserved
*I2C is a Trademark of Philips. All other trademarks mentioned are the property of their respective owners.







X1227 pdf, 数据表
VTRIP Programming Timing Diagram
VCC
(VTRIP)
X1227
VTRIP
tTSU
tTHD
RESET
VCC
SCL
SDA
tVPS
0 123456 7
VP = 15V
01 234567 0 123456 7
tVPH
01234 567
AEh
00h 03h/01h
00h
tVPO
VCC
tRP
VTRIP Programming Parameters
Parameter
Description
tVPS
tVPH
tTSU
tTHD
tVPO
VTRIP Program Enable Voltage Setup time
VTRIP Program Enable Voltage Hold time
VTRIP Setup time
VTRIP Hold (stable) time
VTRIP Program Enable Voltage Off time
(Between successive adjustments)
tRP VTRIP Program Recovery Period
(Between successive adjustments)
VP
VTRAN
Vtv
Programming Voltage
VTRIP Programmed Voltage Range
VTRIP Program variation after programming
(Programmed at 25°C)
VTRIP programming parameters are not 100% Tested.
Min.
1
1
1
10
0
10
14
1.7
-25
Max.
16
5.0
+25
Units
µs
µs
µs
ms
µs
ms
V
V
mV
8 FN8099.2
May 8, 2006







X1227 equivalent, schematic
X1227
Figure 5. Power-on Reset and Low Voltage Reset
VCC
VTRIP
tPURST
RESET
tR
tRPD
tPURST
tF
VRVALID
VCC THRESHOLD RESET PROCEDURE
[OPTIONAL]
The X1227 is shipped with a standard VCC threshold
(VTRIP) voltage. This value will not change over normal
operating and storage conditions. However, in applica-
tions where the standard VTRIP is not exactly right, or if
higher precision is needed in the VTRIP value, the
X1227 threshold may be adjusted. The procedure is
described below, and uses the application of a nonvol-
atile write control signal.
Setting the VTRIP Voltage
It is necessary to reset the trip point before setting the
new value.
To set the new VTRIP voltage, apply the desired
VTRIP threshold voltage to the VCC pin and tie the
RESET pin to the programming voltage VP. Then
write data 00h to address 01h. The stop bit following
a valid write operation initiates the VTRIP program-
ming sequence. Bring RESET to VCC to complete the
operation. Note: this operation may take up to 10 mil-
liseconds to complete and also writes 00h to address
01h of the EEPROM array.
Figure 6. Set VTRIP Level Sequence (VCC = desired VTRIP value)
RESET
VCC
SCL
0 1 23 4 56 7
VP = 15V
01 23 4 56 7
01 23 4 56 7
01 23 4 56 7
VCC
SDA
AEh
Note: BP0, BP1, BP2 must be disabled.
00h
Resetting the VTRIP Voltage
This procedure is used to set the VTRIP to a “native”
voltage level. For example, if the current VTRIP is 4.4V
and the new VTRIP must be 4.0V, then the VTRIP must
be reset. When VTRIP is reset, the new VTRIP is some-
thing less than 1.7V. This procedure must be used to
set the voltage to a lower value.
To reset the new VTRIP voltage, apply more than 3.0V
to the VCC pin and tie the RESET pin to the
programming voltage VP. Then write 00h to address
03h. The stop bit of a valid write operation initiates the
VTRIP programming sequence. Bring RESET to VCC to
complete the operation. Note: this operation takes up
to 10 milliseconds to complete and also writes 00h to
address 03h of the EEPROM array.
01h 00h
For best accuracy in setting VTRIP, it is advised that
the following sequence be used.
1.Program VTRIP as above.
2.Measure resulting VTRIP by measuring the VCC
value where a RESET occurs. Calculate Delta =
(Desired - Measured) VTRIP value.
3.Perform a VTRIP program using the following formula
to set the voltage of the RESET pin:
VRESET = (Desired Value – Delta) + 0.025V
16 FN8099.2
May 8, 2006










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