Asc Current Monitor; Figure 8.1. Pot Circuit Design For Vmon7; Figure 8.2. Pot Wiper Description; Table 8.3. Asc Imon Connections - Lattice Semiconductor MachXO3-940 User Manual

Rotate the POT clockwise to decrease the voltage as shown in
the POT counter-clockwise.
CCW

8.3. ASC Current Monitor

One of the ASC Current Monitors (IMONs) is connected to monitor the MachXO3 core current using resistor R181 as a
shunt. The IMON uses the differential voltage across R181 to monitor the current. The ASC has two IMONs: one is used
for lower voltage (-0.3 V to 5.9 V) current monitoring (pins 19 and 20) and the other HIMON (pins 17 and 18) is used for
higher voltage (4.5 V to 13.2 V) current monitoring. Pin 18 is a shared input pin used for both HIMON and HVMON
(which is VMON10.)

Table 8.3. ASC IMON Connections

Power Name
VCC_CORE ASC_IMONP
ASC_IMONN
User Connected ASC_HIMONP
ASC_HVMON
The VCC_CORE current measurement is designed according to
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trademarks or registered trademarks of their respective holders. The specifications and information herein are subject to change without notice.
FPGA-EB-02004-1.0
+3.3V_ASC
1
POT1_WIPER
POT1
2
3314G-1-103E
3

Figure 8.1. POT Circuit Design for VMON7

Wiper
2
3
1
CW
Clockwise

Figure 8.2. POT Wiper Description

ASC Signal Name ASC Pin Number
R277
1k
ASC_VMON7
Figure 8.2 and to increase the voltage to VMON7, rotate
ASC Breakout Test Point
19 TP30
20 TP31
17 TP28
18 TP29
Figure 8.3.
MachXO3-9400 Development Board
Evaluation Board User Guide
Decreasing
Wiper
Voltage
Comments
R181 (0.020 Ω) is placed
between P/N node for
current measurement
HV IMON positive input
Dual Function: HV IMON
negative input and
VMON10 input
31