TDK5111FXT Infineon Technologies, TDK5111FXT Datasheet - Page 24

• Manufacturer Part Number: TDK5111FXT
• Manufacturer: Infineon Technologies

Specifications of TDK5111FXT

• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• Product Depth (mm): 4.4mm
• Operating Supply Voltage (min): 2.1V
• Operating Supply Voltage (typ): 2.5/3.3V
• Lead Free Status / Rohs Status: Compliant

If the FSK switch is closed, Cv
FSK switch is open, Cv2 (C2 in the application diagram) can be calculated.
Csw:
Remark:
on the layout also and must be adapted for the specific application board.
3.5
The CLKOUT pin is an open collector output. An external pull up resistor (RL) should be
connected between this pin and the positive supply voltage. The value of RL is
depending on the clock frequency and the load capacitance CLD (PCB board plus input
capacitance of the microcontroller). RL can be calculated to:
Table 7
Remark:
Data Sheet
parallel capacitance of the FSK switch (3 pF incl. layout parasitics)
These calculations are only approximations. The necessary values depend
Design Hints on the Clock Output (CLKOUT)
Clock Output
To achieve a low current consumption and a low
spurious radiation, the largest possible RL should be chosen.
CL
10
20
[
5
pF
Cv
]
2
=
C
2
RL
±
=
Cv
fCLKOUT=615.2 kHz
is equal to Cv1 (C1 in the application diagram). If the
=
Csw
±
fCLKOUT
=
∗
Cv
CL
1
24
1
±
(
−
Cv
1
1
(
+
Cv
*
+
ω
8
)
+
2
−
*
)
L
CLD
Cv
∗
(
Cv
1
1
RL
+
Csw
[
kOhm
39
18
10
)
]
V 1.1, 2007-09-18
Applications
TDK5111F