CDB5451A datasheet(8/24 Pages) CIRRUS

부품명	CDB5451A

상세설명	Evaluation Board and Software

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제조업체	CIRRUS [Cirrus Logic]

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CDB5451A

8

DS458DB3

FOUT,” the CS5451A’s on-chip reference provides

1.2 volts. With HDR14 set to position “LT1004,” the

LT1004 provides 1.23 volts (the LT1004 tempera-

ture drift is typically 50 ppm/°C). By setting

HDR14’s jumpers to position “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 in-

put of the CS5451A. (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 CS5451A’s

OWRS pin and GAIN pin.

When these SW1

switches are set to “OPEN” the corresponding pin

on CS5451A is set to D+ potential, which creates a

logic-high state. When the user closes either of

these SW1 switches, the corresponding pin on

CS5451A 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 CS5451A.

(See Figure 3). By pressing on the S1 switch, the

RESET pin on the CS5451A will be held low until

the switch is released.

2.3.6 External Signal In/Out Header

Note that HDR16 is included on the CDB5451A

Evaluation Board as a header that is normally left

unconnected. This header provides a way for the

user to interface the CDB5451A Evaluation Board

to other prototype boards, calibrators, logic analyz-

ers, other peripherals, etc. in order to further eval-

uate the CS5451A device and/or to use the

evaluation board as a platform for the prototype

development of a digital power meter solution.

However, please note that the CDB5451A Evalua-

tion Board is not intended to be integrated directly

into a commercial 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

CS5451A 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 oper-

ation of the digital circuitry on the CDB5451A that

provides the 8-bit parallel data to the PC. Refer to

Figure 3.

The user should recall from CS5451A Data Sheet

that the serial interface on the CS5451A device is

a “master-mode” interface, which means that the

device provides the clock. Once the CS5451A is

powered on, the SCLK pin produces a clock signal,

and data is sent out on the SDO pin of the device.

When the evaluation software is instructed (by the

user) to acquire data through the parallel interface,

a two-step process is performed: First the soft-

ware synchronizes itself to the frame rate of the

CS5451A, then the software acquires multiple

frames of data from the CS5451A.

2.3.7.1. Synchronization

When the software is commanded to acquire data,

the software will first synchronize itself to the frame

rate of the CS5451A (see CS5451A Data Sheet).

This is done by measuring the amount of time be-

tween rising and falling edges of the “BUSY” sig-

nal. (BUSY will change state every time the

CS5451A issues eight SCLKs--See next section

for a more detailed description.) By measuring this

time period, the software can determine the idle

period of the frame, which allows it to be prepared

to collect a complete frame’s worth of data when

the next CS5451A frame is received. This acquisi-

tion sequence is described next.

Reference

Description

HDR14

LT1004

Select on board

LT1004 Reference

(5 ppm/

°C)

VREFOUT

Select reference sup-

plied from CS5451A

VREFOUT pin

EXTVREF

Select external

reference

Table 3. Reference Selection

O O

LT1004

O O

VREFOUT

O O

EXT VREF

O O

LT1004

O O

VREFOUT

O O

EXT VREF

O O

LT1004

O O

VREFOUT

O O

EXT VREF

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