Cirrus Logic CS5460A - Manual (Page 47)

CS5460A
DS487F5 47
5.5 Pulse-Rate Register
Address: 6
Default** = 32000.00Hz
The Pulse-Rate Register determines the frequency of the train of pulses output on the EOUT pin. Each EOUT
pulse represents a predetermined magnitude of real (billable) energy. The register’s smallest valid value is 2
-4
but can be in 2
-5
increments.
5.6 I,V,P,E Signed Output Register Results
Address: 7 - 10
These signed registers contain the last value of the measured results of I, V, P, and E. The results are in the
range of -1.0
 I, V, P, E  1.0. The value is represented in two's complement notation, with the binary point
place to the right of the MSB (which is the sign bit). I, V, P, and E are output results registers which contain
signed values. Note that the I, V, and P Registers are updated every conversion cycle, while the E Register is
only updated after each computation cycle. The numeric format of this register is two’s complement notation.
5.7 I
RMS
, V
RMS
Unsigned Output Register Results
Address: 11,12
These unsigned registers contain the last value of the calculated results of I
RMS
and V
RMS
. The results are in
the range of 0.0
 I
RMS
,V
RMS
 1.0. The value is represented in binary notation, with the binary point place to
the left of the MSB. I
RMS
and V
RMS
are output result registers which contain unsigned values.
5.8 Timebase Calibration Register
Address: 13
Default** = 1.000
The Timebase Calibration Register is initialized to 1.0 on reset, allowing the device to function and perform com-
putations. The register can be loaded with the clock frequency error to compensate for a gain error caused by
the crystal/oscillator tolerance. The value is in the range 0.0
TBC  2.0.
MSB LSB
2
18
2
17
2
16
2
15
2
14
2
13
2
12
2
11 ..... 2
1
2
0
2
-1
2
-2
2
-3
2
-4
2
-5
MSB LSB
-(2
0
) 2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7 ..... 2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
MSB LSB
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8 ..... 2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
2
-24
MSB LSB
2
0
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7 ..... 2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23