CS5464(2007) データシートの表示（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 IIN1+
19 IIN1-
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 — Connect to an external quartz crystal. Alternatively, an external clock can be sup-
plied to the XIN pin to provide the system clock for the device.
CPU Clock Output
2 CPUCLK - Logic-level output from crystal oscillator. Can be used to clock an external CPU.
Control Pins and Serial Data I/O
Serial Clock
5 SCLK — Clocks serial data from the SDI pin and to the SDO pin when CS is low. SCLK is a
Schmitt-trigger input when MODE is low and a driven output when MODE is high.
Serial Data Output
6 SDO — Serial data output. Data is clocked out by SCLK.
Chip Select
7 CS — An input that enables the serial interface when MODE is low and a driven output when
MODE is high.
Mode Select
8 MODE — High selects external E2PROM, Low selects external microcontroller. MODE includes a
weak internal pull-down and therefore selects microcontroller mode if not connected.
Energy Outputs
22, 25, E3, E1, E2 — Primarily active-low energy pulse outputs. These can be programmed to output
26 other conditions.
Reset
23 RESET — An active-low Schmitt-trigger input used to reset the chip.
Interrupt
24 INT — Active-low output, indicates that an enabled condition has occurred.
Serial Data Input
27 SDI — Serial data input. Data is clocked in by SCLK.
Analog Inputs/Outputs
Differential Voltage Inputs 9,10 VIN+, VIN- — Differential analog inputs for the voltage channel.
Differential Current Inputs 20,19, IIN1+, IIN1-, IIN2+, IIN2- — Differential analog inputs for the current channels.
16,15
Power Fail Monitor
21 PFMON — Used to monitor the unregulated power supply via a resistive divider. If the PFMON
voltage drops below its low limit, the low-supply detect (LSD) bit is set in the Status register.
Voltage Reference Output
11 VREFOUT — The on-chip voltage reference output. Nominally 2.5 V, referenced to AGND.
Voltage Reference Input
12 VREFIN — The voltage reference input. Can be connected to VREFOUT or external 2.5 V refer-
ence.
Power 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.
Other Pins
Test1, Test2
13,14 NC — Factory use only. Connect to AGND.
6
DS682F1
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