Z51F3220 Datasheet, PDF (13/54 Pages) Zilog, Inc. – 1 green LED to indicate USB power: D5

Z51F3220 Development Kit
User Manual
6
By default, the Z51F3220 Development Board is set up with preinstalled shunts on J16
jumper pins 1–2 and 3–4 to allow the interfacing of the Z51F3220 MCU’s UART0 to the
USB port. When the Board is connected to the USB port of the host PC, LED D5 will be
ON. The default settings and functionalities of these shunts are listed in Table 2.
Table 2. Default Jumper Settings
Headers
J16
J16
J2
J2
Pins
1–2, 3–4
5–6, 7–8
1–2
3–4
Functionality
UART0 to USB
UART1 to USB
V_CC is being measured by AN1
External V_REF, 2.5 V is used for ADC
Notes
Default
Default
Default
As indicated in the table, should you decide to use the the Z51F3220 MCU’s UART1
block as the interface for your own project (currently not supported in this release), move
the J16 shunts to positions 5–6 and 7–8.
By default, Input 1 of the ADC is used to measure the supply voltage. This measurement
point is taken from a middle point in the voltage divider circuit that includes resistors R3
and R6; the scaling is performed by software so that the LCD always displays the actual
voltage. For a visual representation, see the schematic diagram in Figure 32 on page 37.
If a short on the Board should occur, or if its attached component(s) require more than
500 mA, the overcurrent protection functionality will trigger the red LED D6 to illuminate.
In this instance, power to the Board will be terminated, and the USB port of the PC will be
protected from shorting.
Schematic diagrams of the Z51F3220 Development Board are presented on pages 37 and
38 of this document.
The physical dimensions of the Board are 4.01" x 2.50" (101.8 mm x 63.5 mm).
UM024307-1112
Introduction