STFPC311 STMicroelectronics, STFPC311 Datasheet - Page 31

• Manufacturer Part Number: STFPC311
• Description: IC CTRLR/DRVR FRONT PANEL 52PQFP
• Manufacturer: STMicroelectronics

Specifications of STFPC311

• Display Type: Vacuum Fluorescent (VF)
• Interface: Serial
• Current - Supply: 5mA
• Voltage - Supply: 3 V ~ 33.3 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 52-MQFP, 52-PQFP
• For Use With: 497-8394 - BOARD DEMO STFPC311/ST72264497-6454 - BOARD EVAL BASED ON STFPC311
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Configuration: -
• Digits Or Characters: -
• Lead Free Status / Rohs Status: No

STFPC311
12
Note:
Timing characteristics
Table 10.
1. Refer to page on Serial Communication Format.
The pulse width of the segment signal is derived from the oscillator frequency. The value can be
modified by trimming ROSC. One cycle of key scanning consists of one frame and data of 12 x
2 matrices are stored in RAM.
The key scan is only at the end of the frame when the display is ON. When the display is OFF,
the key scan takes place continuously. The grid is turned off during the key scan.
Figure 27. Key scanning and display timing
Symbol
t
PW
PW
CLK-STB
t
t
SETUP
t
HOLD
WAIT
CLK
STB
Clock Pulse Width
Strobe Pulse Width
Data Setup Time
Data Hold Time
Clock-Strobe Time
Wait Time
Timing characteristics ( V
Typical values are at T
Parameter
(1)
A
= 25°C )
CLK
CLK
DD
= 3.3V, T
Test conditions
STB
CLK
A
= -20 to 70°C, unless otherwise noted.
Min.
400
100
100
1
1
1
Values
12 Timing characteristics
Typ.
Max.
Unit
31/39
ns
ns
ns
µs
µs
µs