CDB5471 datasheet(9/26 Pages) CIRRUS

Part #	CDB5471

Description	Evaluation Board and Software

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Manufacturer	CIRRUS [Cirrus Logic]

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CDB5471

DS480DB1

9

ate CS5451 by obtaining a CS5451 sample and

connect it in place of the CS5471 device. Then the

remaining four input channels serve as the inputs to

the CS5451’s four additional input pairs.

Other header options listed in Table 2 allow the

user to set the source of the input clock signal and

the source of the voltage reference (VREFIN) in-

put, etc. The voltage reference options and clock

input options are discussed next.

2.3.2 Voltage Reference Input

To supply the CS5471 with a suitable 1.2 V voltage

reference input at the VREFIN pin, the evaluation

board provides three voltage reference options: on-

chip, on-board, and external. See HDR14 as shown

in Figure 1. Table 3 illustrates the available voltage

reference settings for HDR14. With HDR14’s

jumpers in position “VREFOUT,” the CS5471’s

on-chip reference provides 1.2 volts. With HDR14

set to position “LT1004,” the LT1004 provides

1.23 volts (the LT1004 temperature drift is typical-

ly 50 ppm/°C). By setting HDR14’s jumpers to po-

sition “EXT VREF,” the user can supply an

external voltage reference to J16 connector post

(VREF) and AGND inputs.

2.3.3 Clock Source for XIN

A 4.000 MHz crystal is provided to drive the XIN

input of the CS5471. (See Figure 1.) However, the

user has the option to provide an external oscillator

signal for XIN, by switching the setting of HDR15.

2.3.4 S1 DIP Switch

Referring to Figure 3, the two single-pole single-

throw switches on SW1 DIP switch should be used

to control the logic settings on the CS5471’s

OWRS pin and GAIN pin.

When these SW1

switches are set to “OPEN” the corresponding pin

on CS5471 is set to D+ potential, which creates a

logic-high state. When the user closes either of

these SW1 switches, the corresponding pin on

CS5471 is grounded, which creates a logic-low

state on the pin.

2.3.5 Reset Circuit

Circuitry has been provided which allows the user

to execute a hardware reset on the CS5471. (See

Figure 3). By pressing on the S1 switch, the RE-

SET pin on the CS5471 will be held low until the

switch is released.

2.3.6 External Signal In/Out Header

Note that HDR16 is included on the CDB5471

Evaluation Board as a header that is normally left

unconnected. This header provides a way for the

user to interface the CDB5471 Evaluation Board to

other prototype boards, calibrators, logic analyzers,

other peripherals, etc. in order to further evaluate

the CS5471 device and/or to use the evaluation

board as a platform for the prototype development

of a digital power metering solution. However,

note that the CDB5471 Evaluation Board is not in-

tended to be integrated directly into a commercial

digital power meter. The layout of the board is not

optimized for practical power metering situations.

2.3.7 Serial-to-Parallel Interface

Glue-logic on the evaluation board converts the

CS5471 serial data into 8-bit segments (bytes).

The bytes are sent to the DB25 connector (J17), and

then through the standard printer cable to the user’s

PC. This section briefly describes the operation of

the digital circuitry on the CDB5471 that provides

the 8-bit parallel data to the PC. Refer to Figure 3.

Reference

Description

HDR14

LT1004

Select on board

LT1004 Reference

(5 ppm/

°C)

VREFOUT

Select reference sup-

plied from CS5471

VREFOUT pin

EXTVREF

Select external

reference

Table 3. Reference Selection

O

LT1004

O

VREFOUT

O

EXT VREF

O

LT1004

O

VREFOUT

O

EXT VREF

O

LT1004

O

VREFOUT

O

EXT VREF

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