CS5463
2. PIN DESCRIPTION
Crystal Out
XOUT
CPUCLK
VD+
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
16
15
14
13
XIN
SDI
Crystal In
CPU Clock Output
Positive Digital Supply
Digital Ground
Serial Data Input
Energy Output 2
Energy Output 1
Interrupt
E2
E1
INT
RESET
E3
PFMON
IIN+
IIN-
VA+
AGND
DGND
SCLK
SDO
CS
MODE
VIN+
Serial Clock
Serial Data Ouput
Chip Select
Reset
High Frequency Energy Output
Power Fail Monitor
Differential Current Input
Differential Current Input
Positive Analog Supply
Analog Ground
Mode Select
Differential Voltage Input
Differential Voltage Input
Voltage Reference Output VREFOUT
Voltage Reference Input VREFIN
9
VIN-
10
11
12
Clock Generator
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.
Crystal Out
Crystal In
1,24
CPUCLK - Output of on-chip oscillator which can drive one standard CMOS load.
CPU Clock Output
2
5
Control Pins and Serial Data I/O
Serial Clock Input
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.
SDO -Serial port data output pin.SDO is forced into a high-impedance state when CS is high.
CS - Low, activates the serial port interface.
Serial Data Output
Chip Select
6
7
8
MODE - High, enables the “auto-boot” mode. The mode pin has an internal pull-down resistor.
Mode Select
E3, E1, E2 - Active-low pulses with an output frequency proportional to the selected power. Con-
figurable outputs for active, apparent, and reactive power, negative energy indication, zero cross
detection, and power failure monitoring. E1, E2, E3 outputs are configured in the Operational
Modes Register.
Energy Output
18,21,22
RESET - A Schmitt-Trigger input pin. Low activates Reset, all internal registers (some of which
drive output pins) are set to their default states.
Reset
19
INT - Low, indicates that an enabled event has occurred.
Interrupt
20
23
SDI - Serial port data input pin. Data will be input at a rate determined by SCLK.
Serial Data Input
Analog Inputs/Outputs
Differential Voltage Inputs
Differential Current Inputs
Voltage Reference Output
VIN+, VIN- - Differential analog input pins for the voltage channel.
IIN+, IIN- - Differential analog input pins for the current channel.
9,10
15,16
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.
VREFIN - The input to this pin establishes the voltage reference for the on-chip modulator.
Voltage Reference Input
Power Supply Connections
Positive Digital Supply
Digital Ground
12
VD+ - The positive digital supply.
DGND - Digital Ground.
3
4
VA+ - The positive analog supply.
AGND - Analog ground.
Positive Analog Supply
Analog Ground
14
13
17
PFMON - The power fail monitor pin monitors the analog supply. If the analog supply does not
meet or falls below PFMON’s voltage threshold, a Low-supply Detect (LSD) event is set in the
status register.
Power Fail Monitor
6
DS678PP1
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