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부품번호 | Q42724211xxxx00 기능 |
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기능 | Real Time Clock Module | ||
제조업체 | Epson | ||
로고 | |||
www.DataSheet.co.kr
Order code
90-0362
Manufacturer code
Q42724211000200
DATA SHEET
Description
RTC-72421B REAL TIME CLOCK DIL18 RC
The enclosed information is believed to be correct, Information may change ‘without notice’ due to
product improvement. Users should ensure that the product is suitable for their use. E. & O. E.
Page 1 of 27
Revision A
20/02/2007
Sales: 01206 751166
Technical: 01206 835555
Fax: 01206 751188
www.rapidonline.com
Datasheet pdf - http://www.DataSheet4U.net/
www.DataSheet.co.kr
RTC - 72421 / 72423
CONTENTS
! Overview..............................................................................................1
! Block diagram ......................................................................................1
! Terminal connections...........................................................................2
! Terminal functions ...............................................................................3
! Characteristics .....................................................................................4
1. Absolute maximum ratings ....................................................................................... 4
2. Recommended operating conditions......................................................................... 4
3. Frequency characteristics and current consumption characteristics ......................... 4
4. Electrical characteristics ( DC characteristics ) ......................................................... 4
! Switching characteristics (AC characteristics) .....................................5
1. When ALE is used .................................................................................................... 5
2. When ALE is fixed at VDD......................................................................................... 6
! Registers .............................................................................................7
1. Register table ........................................................................................................... 7
2. Notes ........................................................................................................................ 7
3. Functions of register bits (overview) ......................................................................... 7
4. Setting the fixed-period pulse output mode and fixed-period interrupt mode ............ 8
5. Resetting the fixed-period pulse output mode and fixed-period interrupt mode......... 8
! Register description .............................................................................9
1. Timing registers ........................................................................................................ 9
2. CD register (control register D) ............................................................................... 10
3. CE register (control register E) ............................................................................... 11
4. CF register (control register F)................................................................................ 13
! Using the RTC-72421/RTC-72423.....................................................14
1. Power-on procedure (initialization).......................................................................... 14
2. Read/write of S1 to W registers .............................................................................. 16
3. Write to 30-second ADJ bit ..................................................................................... 16
4. Using the CS1 pin ................................................................................................... 17
! Power supply circuit example.............................................................17
! Examples of connection to general-purpose microprocessor.............18
! External dimensions ..........................................................................19
! Marking layout ...................................................................................19
! Reference data ..................................................................................20
! Application notes ...............................................................................21
1. Notes on handling................................................................................................... 21
2. Notes on packaging................................................................................................ 21
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RTC - 72421 / 72423
! Terminal functions
Signal
D0-D3
(Data bus)
Pin No.
Input/ou
RTC-72421 RTC-72423 tput
Function
Connect these pines to a bi-directional data bus or CPU data bus. Use this bus
to read to and write from the internal counter and registers.
CS1 CS0 RD WR
Mode of D0 to D3
11−14
14−16, 19
Bi-
direction
HL LH
HLHL
HLLL
Output mode (read mode)
Input mode (write mode)
Do not use
L H or L
High impedance (back-up mode)
H H H or L
High impedance (RTC not selected)
A0-A3
(Address bus)
Address input pins used for connection to CPU address, etc. Used to select the
4−7
5, 7, 9, 10
Input
RTC’s internal counter and registers (address selection).
When the RTC is connected to a multiplexed-bus type of CPU, these pines can
also be used in combination with the ALE described below
Reads in address data and CS0 state for internal latching.
When the ALE is high, the address data and CS0 state is read into the RTC.
When the (through-mode) ALE falls, the address data and CS0 state at that
ALE
(Address Latch Enable)
3
WR
(WRite)
RD
(ReaD)
10
8
point are held. The held address data and CS0 status are maintained while
4 Input
the ALE is low.
ALE Address data and CS0 status
H Read into the RTC to set address data
L Held in the RTC (latched at the trailing edge of the ALE)
If the RTC is connected to a CPU that does not have an ALE pin and thus there
is no need to use this ALE pin, fix it to VDD.
Writes the data on D0 to D3 into the register of the address specified by A0 to
13 Input A3, at the leading edge of WR .
Make sure that RD and WR are never low at the same time.
Output data to D0 to D3 from the register at the address specified by A0 to A3,
11 Input while RD is low.
Make sure that RD and WR are never low at the same time.
CS1, CS0
(Chip Select)
15,2
STD.P
(STanDard Pulse)
1
20,2
1
When CS1 is high and CS0 is low, the RTC’s chip-select function is valid and
Input
read and write are enabled.
When the RTC is connected to a multiplexed-bus type of CPU, CS0 requires
the operation of the ALE (see the description of the ALE).
Use CS1 connected to a power voltage detection circuit. When CS1 is high, the
RTC is enabled; when it is low, the RTC is on standby.
When CS1 goes low, the HOLD and RESET bits in the RTC registers are
cleared to 0.
This is an N-channel open drain output pin.
Depending on the setting of the CE register, a fixed-period interrupt signal and a
pulse signal are output.
The output from this pin cannot be inhibited by the CS1 and CS0 signals.
Output
Use a load voltage that is less than or equal to VDD. If not using this pin, keep it
open-circuit.
An example of STD.P connection is shown below.
+5 V or VDD
RTC
At least 2.2 kΩ
STD.P
VDD
GND
(VDD)
N.C.
18
9
16, 17
−
24
12
22,23
3, 6, 8,
17, 18, 21
If the STD.P output is not be used during standby operation, connecting the pull-
up resister to +5 V provides a reduction in current consumption. If the STD.P
output is to be used even during standby, connect the pull-up resistor to the
RTC’s VDD. In this case, the current consumption will be increased by the
amount of current flowing through the pull-up resistor.
Connect this pin to power source. Supply to 5 V ± 10 % to this pin during normal
operation; at least 2 V during battery back-up operation.
Connect this pin to ground.
These pins are connected internally to VDD. Leave them open circuit.
These pins are not connected internally. Ground them.
Page − 3
ETM17E-01
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Q42724211xxxx00 | Real Time Clock Module | Epson |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |