CS5464 Просмотр технического описания (PDF) - Cirrus Logic
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CS5464 Datasheet PDF : 46 Pages
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CS5464
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
Factory Test
TEST1 13
Factory Test
TEST2 14
28 XIN
27 SDI
26 E2
25 E1
24 INT
23 RESET
22 E3
21 PFMON
20 IIN+
19 IIN-
18 VA+
17 AGND
16 IIN2+
15 IIN2-
Crystal In
Serial Data Input
Energy Output 2
Energy Output 1
Interrupt
Reset
Energy Output 3
Power Fail Monitor
Differential Current Input
Differential Current Input
Positive Analog Supply
Analog Ground
Differential Current Input
Differential Current Input
Clock Generator
Crystal Out
Crystal In
1,28
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 pull-down by an internal resistor.
Energy Output
22, 25, E3, E1, E2 - Active low pulses with an output frequency proportional to energy.
26
Reset
23 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
24 INT - Low, indicates that an enabled event has occurred.
Serial Data Input
27 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 19,20, IIN+, IIN-, IIN2+, IIN2- - Differential analog input pins for the current channel.
15,16
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
18 VA+ - The positive analog supply.
Analog Ground
17 AGND - Analog ground.
Power Fail Monitor
21 PFMON - The power fail monitor pin monitors the analog supply. If PFMON’s voltage threshold is
tripped, a Low-Supply Detect (LSD) event is set in the status register.
Test Connections
Factory Test
13,14 TEST1, TEST2 - Factory use only. Connect to AGND.
6
DS682PP1
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