RA8900SA Datasheet, PDF (1/2 Pages) Epson Company – REAL TIME CLOCK MODULE (I2C-Bus)

Real time clock module
REAL TIME CLOCK MODULE (I²C-Bus)
For Automotive
Built-in 32.768 kHz-DTCXO, High Stability
CE
and Power Switching
RA 8900 SA/CE
Product Number (Please contact us)
RA8900SA: X1B000282Axxx00
RA8900CE: X1B000271Axxx00
Built in frequency adjusted 32.768 kHz crystal unit and DTCXO.
Interface Type
: I²C-Bus interface (400kHz)
Interface voltage range
: 2.5 V to 5.5 V
Temp. compensated voltage range : 2.0 V to 5.5 V
Clock supply voltage range
: 1.6 V to 5.5 V
Selectable clock output (32.768 kHz, 1024 Hz, 1 Hz)
The various functions include full calendar, alarm, timer, temp. sensor function.
Applications : Car audio, Car navigation system, Clock
Conforms to AEC-Q200
*The I²C-BUS is a trademark of NXP Semiconductors.
Actual size
RA8900SA
RA8900SA
(10.1 × 7.4 × 3.3 mm)
RA8900CE
RA8900CE
(3.2 × 2.5 × 1.0 mm)
Block diagramç
VDD
VBAT
/ INT
FOE
FOUT
SCL
SDA
( 32.768 kHz )
DTCXO
DIVIDER
POWER
CONTROLLER
INTERRUPTS
CONTROLLER
FOUT
CONTROLLER
BUS
INTERFACE
CIRCUIT
CLOCK
and
CALENDR
TIMER REGISTER
ALARM REGISTER
CONTROL
R EGISTER
and
SYSTEM
CONTROL LER
ç ç ç Overviewç
ç
High Stability
UA ± 3.4 x 10^-6 / -40 ºC to +85 ºC
( Equivalent to 9 seconds of month deviation )
UB ± 5.0 x 10^-6 / -40 ºC to +85 ºC
( Equivalent to 13 seconds of month deviation )
UC ± 5.0 x 10^-6 / -30 ºC to +70 ºC
( Equivalent to 13 seconds of month deviation )
 32.768 kHz frequency output function
 FOUT pin output (C-MOS output), CL=30 pF
 Output selectable: 32.768 kHz, 1024 Hz, 1 Hz
Available automatic battery backup switch-over function
When VDD deteriorates, internal source is switched to VBAT.
A very small leakage current
Timer function
Timer function can be set up between 1/4096 second
and 4095 minutes.
Alarm function
Alarm function can be set to day of week, day, hour, and minute.
Temp. sensor function
The temperature data are output to a register by a temp. sensor
function. (Bank.2_Add17h)
Pin Functionç
Signal Name
T1(CE)
SCL
FOUT
VBAT
VDD
FOE
/ INT
GND
T2(VPP)
SDA
I/O
input
input
Output
-
-
input
Output
-
-
I/O
Function
Use by the manufacture for testing.
( Do not connect externally.)
Serial clock input pin.
The pin outputs the reference clock signal.
( CMOS output )
Battery supply.
This pin has charge capability to backup battery.
Connected to a positive power supply
The input pin for the FOUT output control.
Interrupt output (N-ch. open drain).
Connected to a ground
Use by the manufacture for testing.
( Do not connect externally.)
Data input and output pin.
ç ç ç Terminal connection/External dimensionsç
(Unit:mm)ç
 RA8900SA
1. T1(CE)
2. SCL
3. FOUT
4. N.C.
5.0
5. VBAT
6. VDD
7. FOE
7.40.2
SOP14 pin
14. N.C.
13. SDA
12. T2(VPP)
11. GND
10. /INT
9. N.C.
8. N.C.
1. FOE
2. VDD
3. VBAT
4. FOUT
5. SCL
RA8900CE
2.5 ± 0.2
10. /INT
9. GND
8. T2(VPP)
7. SDA
6. T1(CE)
The metal case inside of the molding compound may be exposed on the top or bottom of this product.
This purely cosmetic and does not have any effect on quality, reliability or electrical specs.
Specifications (characteristics)
Electrical Characteristics
Item
Symbol
Conditions
Min. Typ. Max.
Operating voltage
Temp. compensated Voltage
Clock supply voltage
Operating temperature
VDD
VTEM
VCLK
TOPR
Stability
f/f
 Interface voltage
Temp. compensated voltage
Internal clock
No condensation
UA
Ta= -40 ºC to +85 ºC
UB
Ta=-40 ºC to +85 ºC
UC
Ta= -30 ºC to +70 ºC
2.5 3.0 5.5
2.0 3.0 5.5
1.6 3.0 5.5
-40 +25 +85
±3.4¹
±5.0²
Current consumption (1)
Current consumption (2)
fSCL=0Hz, /INT=VDD,
IDD1 FOE =GND
VDD = 5V
VDD=VBAT
FOUT: OFF
IDD2 ^{Temp. Compensation} VDD = 3V
interval 2.0 s.
- 0.72 1.5
- 0.70 1.4
^{1)} Equivalent to 9 seconds of month deviation. ^{2)ï€} Equivalent to 13 seconds of month deviation.
Unit
V
V
V
ºC
10^-6
A
 Refer to application manual for details. ç
32.768 kHz-DTCXO Frequency temperature characteristics (Example)
Frequency temperature characteristics
10
5
32.768 kHz DTCXO
0
-5
-10
-15
Tuning fork X'tal
-20
-25
-30
-45 -35 -25 -15 -5 5 15 25 35 45 55 65 75 85
Temperature (ºC)