PT6397 Datasheet, PDF (3/4 Pages) Princeton Technology Corp – 32 Bits VFD Driver Controller with RTC IC

PT6397
3. PIN DESCRIPTION
Pin Name
I/O
Description
Pin No.
VDD
- Logic power supply
1
OSCI
I Oscillator input(4.194304MHz crystal input)
2
OSCO
O Oscillator output(4.194304MHz crystal output)
3
LGND
- Logic ground
4
DIN/A2
(Schmitt Trigger)
I
This pin is data input pin when IF_sel is set to 4-wire serial interface. Data must be
ready at the rising edge of CLK (shift-in data must be started from LSB to MSB).
The I²C device address A2 input pin when the IF_sel is set to I²C serial interface.
5
Clock input pin when IF_sel is set to 4-wire serial interface.
CLK/A1
(Schmitt Trigger)
I
Serial data is read at the rising edge and outputs data is valid at the falling edge.
The I²C device address A1 input pin when the serial interface is set to I²C serial
6
interface.
When IF_sel is set to 4-wire serial interface, it is a low-active serial interface strobe pin.
STB/A0
(Schmitt Trigger)
I
The data input after STB actived is processed as a command. When STB is “HIGH”,
CLK is ignored. The I²C device address A0 input pin when the serial interface is set to
7
I²C serial interface.
DOUT
Data output pin(N-Channel, Open-Drain)
O This pin is output of serial data at the falling edge of the shift clock(starting from the
8
LSB).
/INT
O
Alarm interrupt pin(N-Channel, Open-Drain)
When the setting of alarm date is matched with RTC date, /INT will be set to “0”.
9
64Hz
O OSC’s frequency output=4.194304MHz / 2¹⁶, Duty=50%
10
SCL
I The clock pin of I²C interface
11
SDA
I/O The data pin of I²C interface
12
Adj (See Note) I Clock adjust. Pulse width must be 3 clocks(OSC) at least.
13
Serial interface mode setting, pull -high with resistor
IF_sel
I ^{IF_sel: “0” → I2C serial interface}
14
“1” → 4-wire serial interface
SG32/GR1 to
SG17/GR16
O High voltage segment/grid output pins
15 to 30
VH
- High voltage driver supply pin
31
SG16/GR17 to
SG9/GR24
O High voltage segment/grid output pins
32 to 39
SG8 to SG1 O High voltage segment output pins
40 to 47
PGND
- High voltage driver GND pin
48
Test
I “1”: test mode; “0”: normal mode
49
GPIO1 to GPIO3 I/O General purpose I/O pin, default is set as input port
50 to 52
Note:
The “Adj” pin is used to adjust the RTC, and the adjust is effective by pulse trigger, the following operations are performed by sending a pulse to “Adj”
pin.
For minute digits, ranging from “00” ~ “29” Minute digits of RTC counters which is smaller than 30 are reset to 00. For minute digits, ranging from “30”
~ “59”. Minute digits of RTC counters which is equal to or larger than 30 are reset to 00 and the hour digits are incremented by 1.
Ex.
(X-1) hours, 30 minutes, 0 second
X hours, 0 minute, 0 second X hours, 0 minute, 0 second
X hours, 29 minutes, 59 seconds
X hours, 30 minutes, 0 second
X hours, 59 minutes, 59 seconds (X+1) hours, 0 minute, 0 second
(X+1) hours, 29 minutes, 29 seconds
The “year”, “month” and “day” will be updated when (X) is the last hours.
V1.0
3
February 2010