Datasheet

Emulator Accessories
 2013 Microchip Technology Inc. DS52085A-page 121
13.4.1 Isolator Unit Design
The isolator is a bridge where electrically hot signals are passed through transparently
to the emulator. The ICSP interface signals are magnetically or optically isolated pro-
viding up to 2.5KV equivalent isolation protection. The isolator is housed in its own
enclosure providing an additional measure of safety.
This unit contains the same circuitry as the high-speed receiver board (see
Section 13.3.2 “High-Speed Receiver Board”) plus isolation circuitry (see the
following schematics).
FIGURE 13-10: ISOLATOR UNIT SCHEMATIC - ICSPDAT
FIGURE 13-11: ISOLATOR UNIT SCHEMATIC - ICSPCLK
LVD+
LVD-
R1
100
DATA_EN
NDATA_EN
74AHC1G04_SOT-23_5L
2
4
U9
SN65MLVD206
U1
2
1
3
4
6
7
DATA
ADUM3401_SO16_300
HOT_VDD
HOT_ICSPDAT
HOT_DEN
U7
+3.3V
VDD1 VDD2
GND1
GND2
GND1
GND2
ISO
1
3
4
5
6
7
2
8
16
14
13
12
10
11
9
15
LVC+
LVC-
R1
100
CLK_EN
NCLK_EN
74AHC1G04_SOT-23_5L
2
4
U11
SN65MLVD206
U2
2
1
3
4
6
7
CLK
ADUM3401_SO16_300
HOT_VDD
HOT_ICSPCLK
HOT_CEN
U13
+3.3V
VDD1 VDD2
GND1
GND2
GND1
GND2
ISO
1
3
4
5
6
7
2
8
16
14
13
12
10
11
9
15