NXP Semiconductors KIT33771TPLEVB, Руководство пользователя, Страница: 19 / 32

KIT33771TPLEVB evaluation board, Rev. 2.0
NXP Semiconductors 19
Configuring the hardware
5.2.2 Connecting an external shunt (disconnecting the embedded shunt)
To connect an external shunt, disconnect the embedded shunt by removing resistors R109, R110, R111, R115, R116.
5.2.2.1 Configuration 1: measuring external loads and KIT33771TPLEVB currents
Figure 15 illustrates the connections required to measure both external load currents and KIT33771TPLEVB loads.
1. Connect the battery stack to the X1-1 to X1-4 pins (positive) and X1-33, X1-31 pins (negative).
2. Connect one side of the external shunt to the X1-33 and X1-31 pins. Connect the other side to X1-34 and X1-32 pins.
Figure 15. ISENSE connection
5.2.2.2 Configuration 2: measuring an external load current only
Figure 16 illustrates the connections required to measure an external load current only.
1. Connect the positive side of the battery stack to the X1-1 to X1-4 pins. Connect the negative side of the battery stack to the X1-33
and the X1-34 pins.
2. Connect one side of the external shunt to the load and to X1-31 (). Connect the other side of the external shunt to X1-34
(EVB neg) and X1-32 (Isense
−
).
Figure 16. ISENSE connection for an external load
shunt
to load
R1 39
CB_1
X1-33 33 CTR R25 3.0 K R74 2.00 K
CT_REF
C73
0.047 uF
0.047 uF C80
C64 0.47 uF
IS+ 31
C29
220 PF
R12 127
C66
6.8 uF
C31
220 PF
R13 127 32
34
X1-31
X1-32
X1-34
NEG_BAT
CONN 2X17
CONN 2X17
CONN 2X17
CONN 2X17
shunt
to load
R1 39 CB_1
X1-33 33 CTR R25 3.0 K R74 2.00 K CT_REF
C73
0.047 uF
0.047 uF C80
C64 0.047 uF
IS+ 31
C29
220 PF
R12 127
C66
6.8 uF
C31
220 PF
R13 127
32
34
X1-31
X1-32
X1-34
NEG_BAT
CONN 2X17
CONN 2X17
CONN 2X17
CONN 2X17