CS5461-IS データシートの表示（PDF） - Cirrus Logic
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CS5461-IS Datasheet PDF : 45 Pages
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2. PIN DESCRIPTION
Crystal Out
XOUT 1
CPU Clock Output CPUCLK 2
Positive Power 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
CS5461
24 XIN
23 SDI
22 EDIR
21 EOUT
20 INT
19 RESET
18 FOUT
17 PFMON
16 IIN+
15 IIN-
14 VA+
13 VA-
Crystal In
Serial Data Input
Energy Direction Indicator
Energy Output
Interrupt
Reset
High Frequency 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 - A gate inside the chip is connected to these pins and can be used with a
crystal to provide the system clock for the device. Alternatively, an external (CMOS
compatible) clock can be supplied into 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 clock signal on this pin determines the input and output rate of the data for the
SDI and SDO pins respectively. This is a Schmitt Trigger input to allow for slow rise time
signals. The SCLK pin will recognize clocks only when CS is low.
Serial Data Output
6 SDO -The serial data port output pin. Its output is in a high impedance state when CS is
high.
Chip Select
7 CS - When low, the port will recognize SCLK. An active high on this pin forces the SDO
pin to a high impedance state.
Mode Select
8 MODE - When at logic high, the CS5461 will operate in auto-boot mode. For normal
operation this pin must be left unconnected.
High-Frequency
Energy Output
18 FOUT - Issues active-low pulses, such that the number of pulses is proportional to the
measured real energy. The energy-to-pulse ratio is programmed in the PulseRateF Reg-
ister.
Reset
19 RESET - When reset is taken low, all internal registers are set to their default states.
Interrupt
20 INT - When INT goes low it signals that an enabled event has occurred.
Energy Output
21 EOUT - Issues fixed-width pulses, such that the number of pulses is proportional to the
real energy registration of the device. The energy-to-pulse ratio is programmed in the
PulseRateE Register.
Energy Direction
Indicator
22
EDIR - Indicates if the measured energy is negative.
Serial Data Input
23 SDI - The serial data port input pin. Data will be input at a rate determined by SCLK.
6
DS546F2
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