Microchip Technology PAC1710, Руководство пользователя

Страница: 28 / 54

PAC17X0 High-Side Current Sensors Evaluation Board User’s Guide
DS50002367A-page 28

2015 Microchip Technology Inc.
3.6 DEMO MODE SETUP AND OPERATION
Demo mode uses three on-board current sources to exercise and demonstrate the
features of the PAC1710 and PAC1720 devices. Jumpers J3, J4, J8 and J9 are initially
set for Demo mode (see
Section 3.4 “Jumper Settings” ).
3.6.1 Steady-State Current Source
A constant current source is provided using +5V USB as the supply. This current is
adjustable from zero to approximately 85 mA (80 mV range) using rotary switch, SW1
SS Amp Adjust. Parallel sense resistors are provided for a combined value of one ohm,
with accuracy less than or equal to 0.3%. This is used to convert the current to a cor-
responding voltage for the PAC1720 to read at the SENSE+ and SENSE- inputs. The
steady-state current consumption for the rotary switch SW3 Pulse Duration settings, in
conjunction with the J16 jumper position which sets the range, are shown in
Table 3-4 .
TABLE 3-4: STEADY-STATE CURRENT CONSUMPTION
SW1
Position
J16 Jumper Position
Pins 1-2
(80 mV Range)
Pins 2-3
(40 mV Range)
Pins 3-4
(20 mV Range)
Pins 5-6
(10 mV Range)
0 0 mA 0 mA 0 mA 0 mA
1 ~6.6 mA ~3.3 mA ~1.6 mA ~0.8 mA
2 ~13.2 mA ~6.6 mA ~3.2 mA ~1.7 mA
3 ~19.4 mA ~9.6 mA ~4.6 mA ~2.4 mA
4 ~26.8 mA ~13.3 mA ~6.4 mA ~3.4 mA
5 ~32.4 mA ~16.0 mA ~7.8 mA ~4.1 mA
6 ~38.1 mA ~18.9 mA ~9.1 mA ~4.8 mA
7 ~43.4 mA ~21.5 mA ~10.4 mA ~5.5 mA
8 ~53.2 mA ~26.3 mA ~12.8 mA ~6.7 mA
9 ~57.9 mA ~28.7 mA ~13.9 mA ~7.3 mA
A ~62.8 mA ~31.1 mA ~15.1 mA ~7.9 mA
B ~67.2 mA ~33.3 mA ~16.1 mA ~8.4 mA
C ~72.7 mA ~36.0 mA ~17.4 mA ~9.1 mA
D ~76.9 mA ~38.0 mA ~18.4 mA ~9.7 mA
E ~81.1 mA ~40.1 mA ~19.4 mA ~10.2 mA
F ~85.0 mA ~42.1 mA ~20.4 mA ~10.7 mA