ข้อมูลแบบเข้าใจง่าย (Specification)
Part : UPD4992Brand : NEC
Description : 8-Bit Parallel I/O Calendar Clock
Package : SOP-20
Supply voltage VDD : –0.3 to 7.0 V
Input voltage range VIN: –0.3 to VDD + 0.3 V
Output pin withstand voltage VOUT: 7.0 V
Low level output current IOUT 30 mA
Operating temperature range Topt –40 to +85 °C
Storage temperature range Tstg –65 to +125 °C
โปรแกรมประยุกต์ (Applications)
• Internal counter for time (hour, minute, second), and calendar (leap year, year, month, day of month, day of week)
• Super low power consumption (IDD = 2 mA MAX. at VDD = 2.4 V)
• Automatic determination of leap year, manual setting possible
• 12 hour/24 hour mode selectable
• 8-bit parallel input/output in BCD data format
• 12 kinds of interval timer output (can be used as watchdog timer)
• Internal voltage detection circuit for automatic determination of battery run-down
• High accuracy
ความหมายของแต่ละขาบอกอะไรบ้าง
CS1 Chip select input 2 Internal register can be accessed when CS1 = L
CS2 Chip select input 17 and CS2 = H
WR Write signal input 3 Writes the contents of data bus to the register selected by address input at the rising edge
RD Read signal input 7 Outputs the contents of the register selected by
address input to the data bus at the rising edge
D0 to D7 Data input/output 8, 9, 11 to 16 Data input/output bus
A0 to A2 Address input 4 to 6 Address input to select internal register
TP Timing pulse output 1 Interval signal and timing pulse output (N ch open
drain output)
XIN Crystal resonator connection pin 19 Crystal resonator and capacitor are connected to
XOUT Crystal resonator connection pin 18 these pins.
VDD Power supply pin 20 2.4 V to 5.5 V
VSS GND 10 Connect to GND
ขนาดไซร์มาตราฐานของ UPD4992
