CS5461A Ver la hoja de datos (PDF) - Cirrus Logic
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CS5461A Datasheet PDF : 44 Pages
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CS5461A
2. PIN DESCRIPTION
Crystal Out
XOUT 1
CPU Clock Output CPUCLK 2
Positive Digital Supply
VD+ 3
Digital Ground
DGND 4
Serial Clock
SCLK 5
Serial Data Ouput
SDO 6
Chip Select
CS 7
Mode Select
MODE 8
Differential Voltage Input
VIN+ 9
Differential Voltage Input
VIN- 10
Voltage Reference Output VREFOUT 11
Voltage Reference Input VREFIN 12
24 XIN
23 SDI
22 E2
21 E1
20 INT
19 RESET
18 E3
17 PFMON
16 IIN+
15 IIN-
14 VA+
13 AGND
Crystal In
Serial Data Input
Energy Output 2
Energy Output 1
Interrupt
Reset
High Frequency Energy Output
Power Fail Monitor
Differential Current Input
Differential Current Input
Positive Analog Supply
Analog Ground
Clock Generator
Crystal Out
Crystal In
1,24
XOUT, XIN - The output and input of an inverting amplifier. Oscillation occurs when connected to
a crystal, providing an on-chip system clock. Alternatively, an external clock can be supplied to
the XIN pin to provide the system clock for the device.
CPU Clock Output
2 CPUCLK - Output of on-chip oscillator which can drive one standard CMOS load.
Control Pins and Serial Data I/O
Serial Clock Input
5 SCLK - A Schmitt Trigger input pin. Clocks data from the SDI pin into the receive buffer and out of
the transmit buffer onto the SDO pin when CS is low.
Serial Data Output
6 SDO -Serial port data output pin.SDO is forced into a high impedance state when CS is high.
Chip Select
7 CS - Low, activates the serial port interface.
Mode Select
8 MODE - High, enables the “auto-boot” mode. The mode pin is pulled low by an internal resistor.
High Frequency Energy
Output
18 E3 - Active low pulses with an output frequency proportional to the active power. Used to assist
in system calibration.
Reset
19 RESET - A Schmitt Trigger input pin. Low activates Reset, all internal registers (some of which
drive output pins) are set to their default states.
Interrupt
20 INT - Low, indicates that an enabled event has occurred.
Energy Output
21,22 E1, E2 - Active low pulses with an output frequency proportional to the active power. Indicates if
the measured energy is negative.
Serial Data Input
23 SDI - Serial port data input pin. Data will be input at a rate determined by SCLK.
Analog Inputs/Outputs
Differential Voltage Inputs 9,10 VIN+, VIN- - Differential analog input pins for the voltage channel.
Differential Current Inputs 15,16 IIN+, IIN- - Differential analog input pins for the current channel.
Voltage Reference Output
11 VREFOUT - The on-chip voltage reference output. The voltage reference has a nominal magni-
tude of 2.5 V and is referenced to the AGND pin on the converter.
Voltage Reference Input
12 VREFIN - The input to this pin establishes the voltage reference for the on-chip modulator.
Power Supply Connections
Positive Digital Supply
3 VD+ - The positive digital supply.
Digital Ground
4 DGND - Digital Ground.
Positive Analog Supply
14 VA+ - The positive analog supply.
Analog Ground
13 AGND - Analog ground.
Power Fail Monitor
17 PFMON - The power fail monitor pin monitors the analog supply. If PFMON’s voltage threshold is
not met, a Low-Supply Detect (LSD) bit is set in the status register.
6
DS661F2
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