PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 507

• Manufacturer Part Number: PSB21473FV13XT
• Manufacturer: Infineon Technologies

Specifications of PSB21473FV13XT

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 144
• Lead Free Status / RoHS Status: Compliant

21
The Terminal Specific Functions (TSF) comprises the keypad scanner and the LED
multiplex unit.
There is no global clock control register, but the different modules can be en/-disabled
individually by programming the only global register TSF_CONF.
21.1
•
Figure 21-1 Key Scanner
The keypad scanner supports keypads with up to 45 keys organized in 9 rows and 9
columns in a ’half matrix’ structure.
The matrix is shown in figure Figure 21-1. For the port pin of the keypad scanner the
internal pull-up transistors can be enabled, so that no external resistors are needed.
A logical low value in Figure 21-2 indicates a line which is driven to low by the INCA-D.
An <XXX> indicates the period during which a line becomes an input and is evaluated
by the keypad scanner. If the input level is low, the corresponding key is pressed.
Note: To recognize a certain number of concurrently pressed keys non-ambiguously, the
Data Sheet
Interrupt
Keypad
selection of those keys has to be done in a certain manner. Because of the
Terminal Specific Functions
Keypad Scanner
Scanner
Keypad
XBUS
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10
9
6
5
4
3
2
1
8
7
8
Terminal Specific Functions
7
6
5
4
3
2
PSB 21473
1
2003-03-31
INCA-D
0