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PDF CDB5461 Data sheet ( Hoja de datos )
| Número de pieza | CDB5461 | |
| Descripción | Evaluation Board and Software | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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CDB5461
CDB5461 Evaluation Board and Software
Features
z Direct Shunt Sensor and Current
Transformer Interface
z RS-232 Serial Communication with PC
z On-board 8051 Microcontroller
z On-board Voltage Reference
z Lab Windows/CVITM Evaluation Software
- Register Setup & Chip Control
- FFT Analysis
- Time Domain Analysis
- Noise Histogram Analysis
z On-board Data SRAM
z Integrated RS-232 Test Mode
z “Auto-Boot” Demo with serial EEPROM
General Description
The CDB5461 is an inexpensive tool designed to evalu-
ate the functionality and performance of the CS5461.
The CS5461 Data Sheet is supplied in conjunction with
the CDB5461 evaluation board.
The evaluation board includes an LT1019 voltage refer-
ence, an 8051 microcontroller, an RS232 transceiver,
and firmware. The 8051 controls the serial communica-
tion between the evaluation board and the PC via the
firmware, enabling quick and easy access to all of the
CS5461’s registers and functions.
The CDB5461 includes software for Data Capture, Time
Domain Analysis, Histogram Analysis, and Frequency
Domain Analysis.
ORDERING INFORMATION
CDB5461
Evaluation Board
VA+
VIN+
VIN-
IIN+
IIN
-
VA- GND
CRYSTAL
4.096 MHz
SERIAL
EEPROM
CS5461
CS
SDI
SDO
SCLK
INT
EDIR
EOUT
VREF
IN OUT
VD+
TEST
SWITCHES
Vu+
CRYSTAL
20.0 MHz
8051
Microcontroller
REF
AGND
VOLTAGE
REFERENCE
LEDs
RS232
TRANSCEIVER
8051
ISP
32k × 8
SRAM
RESET
CIRCUITRY
Cirrus Logic, Inc.
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2004
(All Rights Reserved)
APR ‘04
DS487DB4
1 page  
CDB5461
1.2.2 Digital Section
The schematics for the digital section are
shown in Figure 10 on page 22. The digital
section contains the microcontroller, test
switches, a Maxim MAX3232 interface chip,
32K bytes of SRAM, and one serial EEPROM.
The test switches aid in debugging communi-
cation problems between the CDB5461 and
the PC. The microcontroller derives its clock
from a 20.0 MHz crystal. From this, The RS-
232 data conversion IC (10) is configured to
communicate via RS-232 at 9600 baud, no
parity, 8-bit data, and 1 stop bit.
1.2.3 Power Supply Section
Figure 11 on page 23 illustrates the power
supply connections to the evaluation board.
The VA+ post supplies the positive analog
section of the evaluation board, the LT1019,
and the ADC. The VA- post supplies the nega-
tive analog voltage circuitry. This terminal is
grounded when powering the CDB5461 from a
single +5 Volt analog supply. The VD+ post
supplies the digital section of the ADC and lev-
el shifter. The Vu+ post supplies the digital
section of the evaluation board, the 8051, the
reset circuitry, and the RS-232 interface cir-
cuitry. The board’s digital section, supplied via
Vu+ post, must be +5 Volts only. Table 2
shows the various power connections with the
required jumper settings on J12 and J11.
1.3 Using the Evaluation Board
The CS5461 contains a programmable gain
amplifier (PGA), two ∆Σ modulators, two high
rate filters, an on-chip reference, and power
calculation engine to compute Energy, VRMS,
IRMS, and Instantaneous Power. The PGA
sets the input levels of the current channel at
either 50 mVRMS or 250 mVRMS (for VREFIN =
2.5 V). The on-chip reference can provide the
necessary 2.5 V reference. This output (VRE-
FOUT) is used to supply the VREFIN pin with
2.5 V. The ∆Σ modulators and high rate digital
filter allow the user to measure instantaneous
voltage, current, and power at a output word
rate of 4000 Hz when a 4.096 MHz clock
source is used.
Table 3 on page 6 describes the various head-
ers, jumpers and DIP switches on the
CDB5461 evaluation board. DIP switch S1 is
used to control the 8051. Table 4 on page 7 il-
lustrates the various settings of the DIP switch
S1. The S1-3 switch should be set to the
Power Supplies
Analog
Digital
+5V +5V
+5V +3V
Power Post Connections
VA+ VA- GND VD+
Vu+
+5 NC GND
+5
NC
Jumpers
J12 J11
Vu+ O
VD+ O
VD+ O
VA+ O
O VDDD
O VDDD
O D+
O D+
VA- O O GND
A- O O GND
+5 NC GND
+3
Vu+ O O VDDD
+5
VD+ O O VDDD
VD+ O O D+
VA- O O GND
A- O O GND
VA+ O O D+
Table 2. Power Supply Connections
5
5 Page 
CDB5461
is on means that the corresponding bit in the
Status Register is set (except the Invalid Com-
mand bit, which is inverted). The value present
in the Mask register may be changed by the
software during certain operations to provide
correct functionality of the CDB5461 board.
2.4.5 Cycle Count / PulseRateE /
PulseRateF / PulseWidth / VSAGlevel /
VSAGduration / Time Base Registers
These boxes display the values corresponding
register in both hexadecimal and decimal for-
mat. Each register can be modified by typing a
value in the corresponding Value: or HEX:
box.
2.4.6 Control Register
The Control Register contains various bits
used to activate or terminate various features
of the CS5461. Refer to the CS5461 data
sheet for description of the bits. The user is
able to turn each bit on or off individually. The
value of the Control Register is displayed in
HEX. Most of the Control Register bits are re-
served or unused. Only the usable bits are
displayed in the Setup Window.
Figure 3. Calibration Window
2.5 Calibration Window
The Calibration Window is used to display and
write to the CS5461 offset and gain calibration
registers. The user is also able to initiate the
CS5461’s calibration sequences that are used
to set the calibration values. Both AC and DC
calibrations can be run for offset and gain, for
either the voltage channel or the current chan-
nel, or both simultaneously. The user should
refer to the CS5461 data sheet for more details
on calibration.
11
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet CDB5461.PDF ] | |
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