UPD4990AG Renesas Electronics America, UPD4990AG Datasheet - Page 6

• Manufacturer Part Number: UPD4990AG
• Manufacturer: Renesas Electronics America

Specifications of UPD4990AG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

FUNCTION SPECIFICATIONS
4
Crystal frequency (X tal osc.).
Data
Data format
Data input-output and Clock
Timing pulse output
Function mode selection
Chip select
Data output inhibition
C
command
32.768 kHz
Data types are: second, minute, day, week, month, and year.
Leap years, 31-day months, and months with 30 or less days are adjusted automatically.
A 24-hour system is used and last two digits of Gregorian year are indicated.
It is assumed that leap years are expressed by multiples of 4.
Data is represented in BCD notation. Only months are represented in hexadecimal notation.
Data is input/output synchronously with reference to the external clocks input from the CLK pin using the serial
input/output system. (See Fig. 1.)
Three frequencies, 64 Hz, 256 Hz, and 2 048 Hz, can be set with C
Using serial data input command, selective timing pulses (TPs) are 64 Hz, 256 Hz, 2 048 Hz, and 4 096 Hz
and selective output intervals are 1, 10, 30, and 60 seconds.
A function mode can be selected by the inputs from C
serial data input. (C
Each command is latched with STB (strobe).
Connecting the CS pin to the ground level inhibits CLK and STB inputs.
Connecting the OUT ENBL pin to the ground level sets the DATA OUT pin at high impedance.
3
register
'
C
2
' C
1
' C
0
'
* DATA of 52 Bit Shift Register appears on DATA OUT terminal from LSB of second.
MSB
Ten's of
year
0
= C
Unit of
year
1
= C
month
2
= V
DD
the week
)
day of
52 Bit Shift Register
Ten's of
days
Figure 1.
0
, C
Unit of
days
1
, and C
Ten's of
hours
2
. Also a function mode can be selected through
0
Unit of
hours
, C
1
and C
Ten's of
minutes
2
pins.
minutes
Unit of
seconds
Ten's of
D
3
D
2
seconds
D
Unit of
PD4990A
1
LSB
D
0