P9241-G-EVK Evaluation Kit User Manual
© 2019 Integrated Device Technology, Inc.
10
March 1, 2019
External Crystal Circuit
To guarantee that the switching frequency is fixed at an accurate 127.7 kHz, two different types of crystals can be used to guarantee that the
frequency will be in the range defined in Table 2. Only one crystal is necessary; a choice can be made between the crystals designated as Y1
and Y2 in Table 2 by comparing cost and package size. By default, Y1 is populated on the P9241-G EVK board. GPIO_B6 and GPIO_B5 are
used to synchronize with the external crystal. Table 2 gives a list of the recommended devices for the crystal.
Table 2.
External Oscillator Selection
Type
Vendor
Part Number
Typical Frequency (MHz)
Designator
Crystal
ECS, Inc.
ECS-80-18-30B-AGN-TR
8 (
±
50ppm)
Y1
Abracon, LLC
ABLS2-8.000MHZ-D4Y-T
8 (
±
50ppm)
Y2
Figure 11. Crystal Location in the Schematic
Figure 12. Crystal PCB Location
C61
18pF
R84
1M
LDO33
R85
10K
IO_B5
IO_B6
C60
18pF
Y 2
8MHz_NP
1
2
Y 1
8MHz
1
3
2
4
