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NCD2400M Datasheet(PDF) 13 Page - IXYS Corporation

Part No. NCD2400M
Description  Wide Capacitance Range, Non-volatile Digital Programmable Capacitor
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Maker  IXYS [IXYS Corporation]
Homepage  http://www.ixys.com
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NCD2400M Datasheet(HTML) 13 Page - IXYS Corporation

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INTEGRATED CIRCUITS DIVISION
NCD2400M
R01
www.ixysic.com
13
3.3 Non-Volatile Memory Configuration
The 9-bit CDAC code stored in non-volatile memory is
organized in three addressable nibbles as shown
below:
3.4 Device Address
NCD2400M has two available 7-bit device addresses
(Chip ID) hard-coded during manufacturing. These are
shown in the table below.
This simple way of addressing allows for easy
configuration in systems that employ up to two
NCD2400M slaves.
3.5 Operating Modes
The NCD2400M functions in one of two modes,
Volatile and Non-Volatile.
The output capacitance between CP and CN can be
controlled by the value loaded into the volatile register
(Volatile Mode), or by reading the value stored in the
non-volatile memory (Non-Volatile Mode).
3.5.1 Volatile Mode
Volatile Mode provides the means to alter the output
capacitance at any time. Because Volatile Mode is
functional over the entire operational range of the
NCD2400M, the capacitance presented between CP
and CN can be modified under all allowed operating
conditions. Modifying the capacitance in Volatile Mode
is easily accomplished by writing the 9-bit CDAC
control code into the Volatile Register (VR), using the
I2C interface.
Anytime data is written into the Volatile Register,
Volatile Mode is automatically enabled and remains
active until a loss of power or the “Set Non-Volatile
Mode” command is received. The contents of the
volatile register will be lost whenever power to the
device is removed.
3.5.2 Non-Volatile Mode
Non-Volatile Mode is the default mode of operation
and uses the value stored in the Non-Volatile memory
(NV) to configure the capacitor.
By default, upon power up, the NCD2400M operates
in the Non-Volatile Mode. This is advantageous for
applications where reprogramming the capacitance
value is not convenient or for applications where the
end product may be subjected to an unreliable power
environment.
Non-Volatile Mode is entered into automatically at
power up, or after receiving the “Set Non-Volatile
Mode” command.
3.6 I2C Serial Interface
The NCD2400M digitally controlled variable capacitor
can be accessed by an I2C serial interface. The
NCD2400M can only act as a Bus Slave. The Bus
Master initiates the start of a serial transaction by
driving SDA (Serial Data) low while SCL (Serial Clock)
is high. This is the Start bit. Data bit transitions on SDA
are permitted only when SCL is low and are clocked in
by the receiver on the rising edge of SCL. A logic
low (0) Acknowledge (ACK) bit is output onto the SDA
bus by the NCD2400M following each received byte.
Depending on the value of the Read/Write (R/W) bit
following the 7-bit device address (Chip ID), a read or
write command will be executed.
Four operations are available through the serial
interface:
Write Volatile Register
Write Non-Volatile Memory
Read
Set Non-Volatile Mode
Address Selection
Model
Address
(HEX)
Address
(BIN)
Address
(DEC)
NCD2400M
0x60
1100000
96
NCD2400M1
0x61
1100001
97
NON-VOLATILE MEMORY MAP
Address 0x2
NV <8>
Address 0x0
NV <3:0>
Address 0x1
NV <7:4>


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