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RS5C316A
Datasheet
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RICOH RS5C316A, RS5C316B Datasheet

ULTRA-COMPA CT SERIAL
ALARM REAL-TIME CLOCK ICs
RS5C316A/B
ELECTRONIC DEVICES DIVISION
NO.EA-035-9908
APPLICATION MANUAL
NOTICE
4. The technical information described in this application manual shows typical characteristics of and example application circuits for the products. The release of such information is not to be construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual property rights or any other rights.
5. The products listed in this document are intended and designed for use as general electronic components in standard applications (office equipment, computer equipment, measuring instruments, consumer electronic products, amusement equipment etc.). Those customers intending to use a product in an application requiring extreme quality and reliability, for example, in a highly specific application where the failure or misoperation of the product could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system, traffic control system, automotive and transportation equipment, combustion equipment, safety devices, life support system etc.) should first contact us.
6. We are making our continuous effort to improve the quality and reliability of our products, but semiconductor products are likely to fail with certain probability. In order prevent any injury to persons or damages to property resulting from such failure, customers should be careful enough to incorporate safety measures in their design, such as redundancy feature, fire-containment feature and fail-safe feature. We do not assume any liability or responsibility for any loss or damage arising from misuse or inappropriate use of the products.
7. Anti-radiation design is not implemented in the products described in this application manual.
June 1995
OUTLINE
......................................................................................................
1
FEATURES
....................................................................................................
1
BLOCK DIAGRAM
.........................................................................................
2
APPLICATIONS
.............................................................................................
2
PIN CONFIGURATION
...................................................................................
2
PIN DESCRIPTIONS
......................................................................................
3
ABSOLUTE MAXIMUM RATINGS
...................................................................
4
RECOMMENDED OPERATING CONDITIONS
.................................................
4
DC CHARACTERISTICS
................................................................................
5
AC CHARACTERISTICS
................................................................................
5
TIMING CHARTS
...........................................................................................
6
FUNCTIONAL DESCRIPTIONS
......................................................................
7
1. Addressing
.................................................................................................
7
2. Registers
...................................................................................................
8
3. Counters
..................................................................................................
13
USAGES
......................................................................................................
15
1. Read Data (For the RS5C316A)
......................................................................
15
2. Write Data (For the RS5C316A)
.......................................................................
16
3. Read Data (For the RS5C316B)
......................................................................
17
4. Write Data (For the RS5C316B)
.......................................................................
18
5. CE Pin
....................................................................................................
19
6. Configuration of Oscillating Circuit
....................................................................
20
7. Oscillator Halt Sensing
.................................................................................
21
8. Typical Power Supply Circuit
...........................................................................
22
9. Oscillation Frequency Adjustment
.....................................................................
22
10. Interrupt Operation
.....................................................................................
24
RS5C316A/B
APPLICATION MANUAL
CONTENTS
11. Typical Application
.....................................................................................
26
12. Typical Characteristic Measurements
...............................................................
27
13. Typical Software-based Operations
.................................................................
29
PACKAGE DIMENSIONS
..............................................................................
33
TAPING SPECIFICATION
..............................................................................
33
URTRA-COMPACT SERIAL ALARM REAL
TIME CLOCK ICs
1
RS5C316A/B
OUTLINE
The RS5C316A/B are CMOS type real-time clock ICs which are connected to the CPU via three signal lines and capable of serial transmission of clock and calendar data to the CPU. The RS5C316A/B can generate various periodic interrupt clock pulses lasting for long period (one month), further alarm interrupt can be made by days of the week, hours, and minutes. Driving an oscillation circuit at constant volt­age, the circuit undergoes few voltage fluctuations and consequently realizes low current consumption (0.6µA at 3V). It also provides an oscillator halt sensing function for application to data validity at power-on and other occa­sions. Integrated into an ultra compact and ultra thin 8pin SSOP (0.65mm pitch), the RS5C316A/B are the optimum choice for equipment requiring small size and low power consumption. The RS5C316A and the RS5C316B reads/writes data at falling and rising edge of serial clock respectively.
• Time keeping voltage 1.6V to 6.0V
• Lowest supply current 0.6µA TYP. (1.5µA MAX.) at 3V
• Connection to the CPU via only three pins: CE, SCLK/SCLK and SIO for addressing and data read/write
• A clock counter (counting hours, minutes, and seconds) and a calendar counter (counting leap years, years,
months, days, and days of the week) in BCD code
• Periodic interrupt pulses to the CPU with cycles ranging from one month to 1/1024Hz, with interrupt flags and
interrupt halt
• Alarm interrupt (days of the week, hours, minutes)
• Oscillator halt sensing to judge internal data validity
• Second digit adjustment by ±30 seconds
• 12-hour or 24-hour time display selectable
• Automatic leap year recognition up to the year 2099
• CMOS logic
• Package: 8pin SSOP (0.65mm pitch)
FEATURES
APPLICATIONS
• Communication equipment (Multi-function telephone, portable telephone, PHS, pager)
• Business machines (Facsimile, portable facsimile)
• Personal computer (Desktop type, notebook type, word processor, PDA, electronic notebook, TV games)
• Audio visual equipment (Portable audio equipment, video camera, camera, digital camera, remote control equip­ment)
• Home use (Rice cooker, microwave range)
PIN CONFIGURATION
• 8pin SSOP (0.65mm pitch)
CE
1
SCLK
2
SIO
3
VSS
VDD
OSCIN OSCOUT
RS5C316A RS5C316B
INTR
4
8
7 6 5
CE
1
SCLK
2
SIO
3
VSS
VDD
OSCIN OSCOUT
INTR
4
8
7 6 5
RS5C316A/B
2
BLOCK DIAGRAM
OSC DIV
ADDRESS DECODER
ADDRESS REGISTER
TIME COUNTER
(SEC,MIN,HOUR,WEEK,DAY,MONTH,YEAR)
INTERRUPT
CONTROL
SHIFT REGISTER
I/O
CONTROL
OSC DETECT
OSCIN
OSCOUT
ALARM REGISTER (WEEK,MIN,HOUR)
COMPARATOR
SIO
SCLK/SCLK*
CE
INTR
*
) RS5C316A: SCLK RS5C316B: SCLK
RS5C316A/B
3
Pin No.
1
2
3
5
7 6
8 4
PIN DESCRIPTIONS
Symbol
CE
SCLK
(A type)
SCLK
(B type)
SIO
INTR
OSCIN
OSCOUT
VDD
VSS
Name
Chip enable input
Shift clock input
Serial input/output
Interrupt output
Oscillator circuit input/output
Positive/Negative power supply input
Description
The CE pin is used to interface the CPU and is accessible when held at the high level. This pin is connected to a pull-down resistor. It should be switched to the low level or opened when not accessed or when powering off the system. Holding the CE pin high for more than 2.5 seconds forces 1Hz interrupt pulses to be output from the INTR pin for oscillation frequency measurement. (No “1Hz pulse” is out­put for less than 1.5 seconds.)
This pin is used to input shift clock pulses to synchronize data input to, and output from, the SIO pin. SCLK and SCLK are for writing data at falling and rising edge of clock pulses respectively and also reading data at rising and falling edge of clock pulses respectively.
The SIO pin inputs and outputs written or read data in synchronization with shift clock pulses from the SCLK/SCLK pin. The SIO pin causes high impedance when CE pin is held at the low level (CMOS input/output). After the CE pin is switched to the high level and the control bits and the address bits are input from the SIO, the SIO pin performs serial input and output operations.
The INTR pin outputs periodic interrupt pulses and alarm interrupt to the CPU. This pin functions as an Nch open drain output even when the CE pin is held at the low level.
These pins configure an oscillator circuit by connecting a 32.768kHz crystal oscilla­tor between the OSCIN and OSCOUT pins and by connecting a capacitor between the OSCIN and Vss pins. (Any other oscillator circuit components are built into the RS5C316A/B.)
The VDD pin and V
SS pin are connected to the positive power supply and to the
ground level respectively.
RS5C316A/B
4
ABSOLUTE MAXIMUM RATINGS
ABSOLUTE MAXIMUM RATINGS
(VSS=0V)
Symbol Item Conditions Ratings Unit
VDD Supply voltage –0.3 to +7.0 V
VI Input voltage –0.3 to VDD+0.3 V
VO1 Output voltage 1 SIO –0.3 to VDD+0.3 V
VO2 Output voltage 2 INTR –0.3 to +12 V
PD Power dissipation Topt=25°C 300 mW
Topt Operating temperature –40 to +85 ˚C
Tstg Storage temperature –55 to +125 ˚C
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation above these absolute maximum ratings may cause degradation or permanent damage to the device. These are stress ratings only and do not necessarily imply functional operation below these limits.
RECOMMENDED OPERATING CONDITIONS
(VSS=0V, Topt=–40 to +85˚C)
Symbol Item Conditions MIN. TYP. MAX. Unit
VDD Supply voltage 2.5 6.0 V
VCLK Time keeping voltage 1.6 6.0 V
fXT Oscillation frequency 32.768 kHz
CG External oscillation capacitance CL value of crystal=6 to 8pF 5 10 24 pF
V
PUP Pull-up voltage INTR 10 V
RS5C316A/B
5
Symbol Item Pin name Conditions MIN. TYP. MAX. Unit
VIH “H” input voltage CE, SCLK/SCLK, SIO 0.8VDD VDD V
VIL “L” input voltage CE, SCLK/SCLK, SIO 0 0.2VDD V
IOH “H” output current SIO VOH=VDD –0.5V –0.5 mA
IOL1
“L” output current
SIO V
OL1=0.5V 0.5
mA
IOL2 INTR VOL2=0.4V 1 RDN Pull-down resistance CE 45 150 450 kΩ
IILK Input leakage current SCLK/SCLK VI=VDD or VSS –1 1 µA
IOZ1 Output off-state SIO VO=VDD or VSS –2 2
µA
IOZ2 leakage current INTR VO=10V –5 5
I
DD1 Standby current 1 VDD
VDD=3V
0.6 1.5 µA
Input/Output: open
I
DD2 Standby current 2 VDD
VDD=6V
0.8 2.0 µA
Input/Output: open
C
D
Internal oscillation
OSCOUT 10 pF
capacitance
DC CHARACTERISTICS
Unless otherwise specified: VSS=0V, VDD=3V, Topt=–40 to +85˚C, Oscillation frequency=32.768kHz,(CL=6pF, R1=30kΩ), CG=10pF
AC CHARACTERISTICS
(VSS=0V, Topt=–40 to +85˚C, CL=50pF)
Symbol Item
V
DD≥4.5V VDD≥4.0V VDD≥2.5V
Unit
MIN. MAX. MIN. MAX. MIN. MAX.
tCES CE set-up time 175 200 400 ns
tCEH CE hold time 175 200 400 ns
tCR CE inactive time 350 400 800 ns
tSCK SCLK clock cycle time 350 400 800 ns
tCKH
SCLK high time 175 200 400 ns
tCKL SCLK low time 175 200 400 ns tCKS SCLK to CE set-up time 60 80 120 ns
tRE
Data output start time (from rising
120 135 300 ns
of SCLK) (from falling of SCLK)
tRR
Data output delay time (from rising
120 135 300 ns
of SCLK) (from falling of SCLK)
tRZ Output floating time 120 135 300 ns tDS Input data set-up time 50 60 120 ns tDH Input data hold time 50 50 80 ns
RS5C316A/B
6
tSCKtCES
tCKS
tCEH
tCR
tRE
tRZ
tCKHtCKL
tRR
Read Data
Write Data
t
DS tDH
CE
SCLK
SIORead cycle
Write cycle
SIO
tSCKtCES
tCKS
tCEH
tCR
tRE
tRZ
tCKHtCKL
tRR
Read Data
Write Data
t
DS tDH
CE
SCLK
SIORead cycle
Write cycle
SIO
Input/Output conditions: VIH=0.8×VDD, VIL=0.2×VDD, VOH=0.8×VDD, VOL=0.2×VDD
• RS5C316A
• RS5C316B
TIMING CHARTS
*
) Any SCLK/SCLK state is allowed in the hatched area.
RS5C316A/B
7
FUNCTIONAL DESCRIPTIONS
1. Addressing
Address
Registers
Data *
1
A3 A2 A1 A0
D3 D2 D1 D0
0 0 0 0 0
1-second counter (BANK=0) S
8 S4 S2 S1
Day of the week alarm register 1 (BANK=1) AW3 AW2 AW1 AW0
1 0 0 0 1
10-second counter (BANK=0) —*
2
S40 S20 S10
Day of the week alarm register 2 (BANK=1) ALC AW6 AW5 AW4
2 0 0 1 0
1-minute counter (BANK=0) M
8 M4 M2 M1
1-minute alarm register (BANK=1) AM8 AM4 AM2 AM1
3 0 0 1 1
10-minute counter (BANK=0) — M
40 M20 M10
10-minute alarm register (BANK=1) — AM40 AM20 AM10
4 0 1 0 0
1-hour counter (BANK=0) H
8 H4 H2 H1
1-hour alarm register (BANK=1) AH8 AH4 AH2 AH1
5 0 1 0 1
10-hour counter (BANK=0) — — P/A, H
20 H10
10-hour alarm register (BANK=1) ALE — AP/A, AH20 AH10
6 0 1 1 0 Day of the week counter (BANK=0) — W4 W2 W1
7 0 1 1 1 Interrupt cycle register (BANK=0, 1) CT3 CT2 CT1 CT0
8 1 0 0 0 1-day counter (BANK=0) D8 D4 D2 D1
9 1 0 0 1 10-day counter (BANK=0) — — D20 D10
A 1 0 1 0 1-month counter (BANK=0) MO8 MO4 MO2 MO1
B 1 0 1 1 10-month counter (BANK=0) — — — MO10
C 1 1 0 0 1-year counter (BANK=0) Y8 Y4 Y2 Y1
D 1 1 0 1 10-year counter (BANK=0) Y80 Y40 Y20 Y10
E 1 1 1 0 Control register 1 (BANK=0, 1) CTFG ALFG
WTEN
*
6
/XSTP
*
4
ADJ/BSY *
3
F 1 1 1 1 Control register 2 (BANK=0, 1) 12/24 NOP BANK *5TEST *
6
*
1) All the listed data can be read and written.
*
2) The “—” mark indicates data which can be read only and set to “0” when read.
*
3) The ADJ/BSY bit of the control register is set to ADJ for write operation and BSY for read operation.
*
4) The WTEN/XSTP bit of the control register is set to WTEN for write operation and XSTP for read operation.
*
5) The clock/calendar counter and the alarm register can be selected when the BANK=0 and BANK=1 respectively. To designate the BANK is unnec­essary for interrupt cycle register and control register 1/2.
*
6) The WTEN bit and TEST bit are set to “1” when CE is “L”.
RS5C316A/B
8
2. Registers
2.1 Control Register 1 (at Eh)
D3 D2 D1 D0
CTFG
ALFG XSTP BSY
CTFG ALFG WTEN ADJ
(For write operation)
(For read operation)
±30-second Adjustment Bit
ADJ
Description
0 1
Ordinary operation Second digit adjustment
BSY
Description
0 1
Ordinary operation Second digit carry or adjustment
Clock/Counter Busy-state Indication Bit
WTEN
Description
0 1
Disabling of 1-second digit carry for clock counter Enabling of 1-second digit carry for clock counter
Clock Counter Enable/Disable Setting Bit
XSTP
Description
0 1
Ordinary oscillation Oscillator halt sensing
Oscillator Halt Sensing Bit
ALFG
Description
0 1
Unmatched alarm register with clock counter Matched alarm register with clock counter
Alarm Flag Bit
CTFG
Description
0 1
INTR=OFF enabling of write operation when CT
3 bit is set to 1
INTR=L enabling of write operation when CT
3 bit is set to 1
Interrupt Flag Bit
2.1-1 (ADJ)
The following operations are performed by setting the ADJ bit to 1. After this bit is set to 1, the BSY bit is set to 1 for the maximum duration of 122.1µs. If the WTEN bit is 0, these adjustment operations are started after the WTEN bit is set to 1.
1) For second digits ranging from “00” to “29” seconds:
Time counters smaller than seconds are reset and second digits are set to “00”.
2) For second digits ranging from “30” to “59” seconds:
Time counters smaller than seconds are reset and second digits are set to “00”. Minute digits are incremented by 1.
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