CS5462-IS View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS5462-IS

Low Cost Power/Energy IC with Pulse Output

Cirrus Logic 

CS5462

which time the CS5462 will configure itself and re-

sume normal operation.

Supply

Voltage

5V

4V

2.5 V

1V

Reset

0V

Normal

Operation

Reset

Figure 7. Power-on Reset

Time

4.6 Oscillator Characteristics

XIN and XOUT are the input and output of an in-

verting amplifier which can provide oscillation and

can be configured as an on-chip oscillator, as

shown in Figure 8. The oscillator circuit is designed

to work with a quartz crystal or a ceramic resona-

tor. To reduce circuit cost, two load capacitors C1

and C2 are integrated in the device, one between

XIN and DGND, one between XOUT and DGND.

Lead lengths should be minimized to reduce stray

capacitance. To drive the device from an external

clock source, XOUT should be left unconnected

while XIN is driven by the external circuitry. There

is an amplifier between XIN and the digital section

which provides CMOS level signals. This amplifier

works with sinusoidal inputs so there are no prob-

lems with slow edge times.

XOUT

XIN

DGND

C1

Oscillator

Circuit

C2

C1 = C2 = 22 pF

Figure 8. Oscillator Connection

4.7 User Defined Settings

EXAMPLE: Design a hybrid stepper motor meter

with an 2 Hz maximum pulse output frequency on

the E1, E2 pins with 500 mVP-P signal on the in-

puts of the current and voltage channels and the

high pass filter enabled on the current channel

only. Using the figure below these settings can be

selected with two connections.

CAL1

CAL0

FREQ

IGAIN

P1

+4.2%

+0.6%

0.25 Hz (stp) 10x 500mV no hpf

P2

+2.8%

+0.4%

0.5 Hz (stp) 50x 100mV no hpf

P3

+1.4

+0.2%

1 Hz (stp)

10x 500mV hpf both

P4

0

0

2 Hz (stp)

50x 100mV hpf both

P5

-1.4%

-0.2%

4 Hz (stp)

10x 500mV hpf Ich

P6

-2.8%

-0.4%

4 Hz (mc)

50x 100mV hpf Ich

P7

-4.2%

-0.6%

16 Hz (mc)

10x 500mV hpf Vch

Figure 9. Calibration, Frequency Select, and

PGA Select

By directly connecting FREQ with P4 and IGAIN

with P5 the CS5462 is configured to drive a step-

per motor with a maximum pulse output rate of

2 Hz, to support an input range of 50 0mVP-P, and

to remove all DC content on the current signals by

enabling the HPFs on the Ich. The CS5462 is now

ready for calibration.

Before applying power to the chip, connect the

CAL0 and CAL1 pins to P4. This will select

0% + 0% = 0% gain adjustment. After making this

connection the CS5462 is ready to be calibrated.

Once power is applied the CS5462 will begin a

startup sequence in which it will scan the FREQ,

IGAIN, CAL0, and CAL1 pins. After determining

which connections are made the FREQ, IGAIN,

CAL0, and CAL1 pins will become high impedance

inputs and the part will begin normal operation and

start converting. If on-chip calibration is required

place known voltages across the inputs on IIN±

and VIN±.

For example, 150 mVRMS = ~424.26 mVP-P will be

used for both the current and voltage inputs.

424.26 mVP-P is ~84.853% of the maximum full

scale input of both the current and voltage chan-

nels. With this input on both channels the expected

pulse

output

frequency

is

84.853% * 84.853% = 72% of full scale. This

14

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