Cypress CY8CKIT-002 Kit handleiding - Pagina 14

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supply may be as low as 4.25 V or as high as 5.5 V, because it is supplied directly from the USB port.

Note: Some PSoC device families do not support 5-V operation. Refer to the respective device

datasheet for supported voltage selection.

Note: When the target voltage is set to 5 V in PSoC Programmer or PSoC Creator, MiniProg3

provides SCLK and SDAT signals at 3.3 V.

In addition to supplying power, MiniProg3 can also measure voltage on its VTARG line. The PSoC

Programmer GUI displays the VTARG voltage in the Status group box (shown in

page

8). The accuracy of the measurement is 80–100 mV in the VTARG range 0 ≤ U ≤ 4.0 V, and a

maximum of 200 mV in the range 4.0 ≤ U ≤ 5.0.

Note: Although ADC resolution in MiniProg3 is 20 mV, the actual accuracy is approximately 200 mV.

Some users may need to add series resistance on the VTARG domain of the target board.

provides the maximum series resistance values for different voltage levels. Exceeding these values

will result in an unreliable communication link.

Table 3-3. Maximum Series Resistance on VTARG Domain on Target Board

VTARG

5.0 V

3.3 V

2.5 V

1.8 V

3.3.1

Voltage Detection

MiniProg3 can detect voltages in the range of 0 V to 5 V. Many of the Cypress software tools, such

as PSoC Programmer and Bridge Control Panel, display this detected voltage in the application GUI.

CY8CKIT-002 PSoC® MiniProg3 Program and Debug Kit Guide, Doc. # 001-59350 Rev. *I

LIMIT

VIH

0.9*VTARG

4.50 V

0.9*VTARG

2.97 V

0.9*VTARG

2.25 V

0.9*VTARG

1.62 V

Technical Description

Figure 2-3 on

DROP

MAX_SERIES

0.500 V

500 ohm

0.330 V

330 ohm

0.250 V

250 ohm

0.180 V

180 ohm

Table 3-3