TMC2246A
PRODUCT SPECIFICATION
Table 2. Typical TMC2246A Operation Sequence
CLK D1
C1 ENB1 D2
C2 ENB2 D3
C3 ENB3 D4
C4 ENB4 ACC
Sum
0
1
2
3
4
5
-
-
0
1
0
0
-
-
-
0
1
0
0
-
-
-
0
1
1
0
-
-
-
0
1
1
0
-
-
-
-
-
D1(1) C1(1)
D1(2)
D2(1) C2(1)
D2(2) C2(2)
D2(3) C2(3)
D2(4) C2(4)
D3(1) C3(1)
D4(1) C4(1)
0
1
1
0
X
D3(2)
D3(3)
X
X
D4(2)
D4(3)
X
X
D1(3) C1(3)
D1(4) C1(4)
D3(4) C3(4)
D4(4) C4(4)
S(5)=D1(1)C1(1)+D2(1)C2(1)
+D3(1)C3(1)+D4(1)C4(1)+ 2
-10
6
7
8
S(6)=S(5)+D1(2)C1(1)+D2(2)C2(1)
+D3(2)C3(1)+D4(2)C4(1)
S(7)=S(6)+D1(3)C1(3)+D2(3)C2(3)
+D3(3)C3(1)+D4(3)C4(1)
S(8)=D1(4)C1(4)+D2(4)C2(4)
-10
+D3(4)C3(4)+D4(4)C4(4)+2
Notice in this example, operating in fractional two’s complement mode, that rounding is imposed on the first cycle only of an
accumulation. This avoids the propagation of accumulated roundoff errors.
REV. 1.0.3 9/11/00
11
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