17
ispMACH 4000ZE Pico Development Kit
Lattice Semiconductor
User’s Guide
Clock Sources
All clocks for the Pico Power and GPIO I
2
C demonstration designs originate from the LC4256ZE CPLD on-chip
oscillator and timer (OSCTIMER) block. You may use the expansion header landing to drive a CPLD input with an
external clock source.
Current Sensor Circuits
The board is populated with current sensor circuits connected to the VCC core and VCC I/O supply rails of the
LC4256ZE CPLD. For more information see AN6049,
High-side Current Sensing Techniques for Power Manager
Devices
.
DIP Switch
The evaluation board includes a 4-bit input piano button style switch located on the bottom-right corner of the
board. All four are available as general purpose inputs for the LC4256ZE.
Table 5. DIP Switch Reference
Item
Description
Reference Designators
SW2
Part Number
193-4MS
Manufacturer
CTS
Web Site
www.ctscorp.com
Table 6. DIP Switch Pin Information
SW2
Description
LC4256ZE Pin
Expansion Header Landing
The expansion header provides user GPIOs connected to the LC4256ZE, VMON and TRIM analog I/Os connected
to the POWR6AT6, and the on-board I
2
C/SMBus. The remaining pins serve as power supplies for external connec-
tions. The expansion connector is con• gured as one 2x15 100mil centered pin header.
Table 7. Expansion Connector Reference
Item
Description
Reference Designators
J2
Part Number
HEADER 15X2
Manufacturer
Molex/Waldom Electronics
Web Site
www.molex.com
Table 8. Expansion Header Pin Information
1
SW0 Input
K11
2
SW1 Input
J12
3
SW2 Input
J11
4
SW3 Input
H10
Pin
Number
Function
LC4256ZE
Pin
1
+3.1V
N/A
2
VCCIO_EXT
N/A
3
4K_TDI
TDI
4
USB_TDI
N/A
5
6AT6_TDO
N/A
6
USB_TDO
N/A
