Intersil CDP68HC68A2M96 Cmos serial 10-bit a/d converter Datasheet

CDP68HC68A2
®
Data Sheet
April 2002
CMOS Serial 10-Bit A/D Converter
Features
The CDP68HC68A2 is a CMOS 8-bit or 10-bit successive
approximation analog to digital converter (A/D) with a
standard Serial Peripheral Interface (SPI) bus and eight
multiplexed analog inputs. Voltage referencing is user
selectable to be relative to either VDD or analog channel 0
(AI0). The analog inputs can range between VSS and VDD .
• 10-Bit Resolution
The CDP68HC68A2 employs a switched capacitor,
successive approximation A/D conversion technique which
provides an inherent sample-and-hold function. An onchip
Schmitt oscillator provides the internal timing for the A/D
converter. The Schmitt input can be externally clocked or
connected to a single, external capacitor to form an RC
oscillator with a period of approximately 10-30ns per
picofarad.
• 14µs 10-Bit Conversion Time
Conversion times are proportional to the oscillator period. At
the maximum specified frequency of 1MHz, 10-bit
conversions take 14µs per channel. At the same frequency,
8-bit conversions consume 12µs per channel.
• Intrinsic Sample and Hold
The versatile modes of the CDP68HC68A2 allow any
combination of the eight input channels to be enabled and
any one of the selected channels to be specified as the
“starting” channel. Conversions proceed sequentially
beginning with the starting channel. Nonselected channels
are skipped. Modes can be selected to: sequence from
channel to channel on command; sequence through
channels automatically, converting each channel one time;
or sequence repeatedly through all channels.
The results of 10-bit conversions are stored in 8-bit register
pairs (one pair per channel). The two most significant bits
are stored in the first register of each pair and the eight least
significant bits are stored in the second register of the pair.
To allow faster access, in the 8-bit mode, the results of
conversions are stored in a single register per channel.
A read-only STATUS register facilitates monitoring the
status of conversions. The STATUS register can simply be
polled or the INT pin can be enabled for interrupt driven
communications.
Ordering Information
PART NUMBER
TEMP. RANGE
(oC)
PACKAGE
PKG.
NO.
CDP68HC68A2E
-40 to 85
16 Ld PDIP
E16.3
CDP68HC68A2M
-40 to 85
20 Ld SOIC
M20.3
CDP68HC68A2M96
-40 to 85
Tape & Reel
M20.3
1
FN1963.4
• 8-Bit Mode for Single Data Byte Transfers
• SPI (Serial Peripheral Interface) Compatible
• Operates Ratiometrically Referencing VDD or an External
Source
• 8 Multiplexed Analog Input Channels
• Independent Channel Select
• Three Modes of Operation
• On Chip Oscillator
• Low Power CMOS Circuitry
Pinouts
CDP68HC68A2E (PDIP)
TOP VIEW
OSC 1
16 VDD
INT 2
15 AI1
MISO 3
14 AI2
MOSI 4
13 AI3
SCK 5
12 AI4
CE 6
11 AI5
AI0 / EXT. REF 7
10 AI6
VSS 8
9 AI7
CDP68HC68A2M (SOIC)
TOP VIEW
OSC
1
20 VDD
INT
2
19 AI1
MISO
3
18 AI2
MOSI
4
17 AI3
NC
5
16 NC
NC
6
15 NC
SCK
7
14 AI4
CE
8
13 AI5
AI0 / EXT. REF
9
12 AI6
VSS 10
11 AI7
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright © Intersil Americas Inc. 2002. All Rights Reserved
CDP68HC68A2
Block Diagram
ACC LATCH COMPARATOR
STATUS REGISTER
INTERRUPT
LOGIC
3
SPI CONTROL LOGIC
MOSI
8
8
4
CONTROL LOGIC
DATA REGISTERS (READ ONLY)
4
4
8
CAR
A/D CONVERTER LATCH
4
CHOPPER
STABILIZED
COMPARATOR
ADDRESS CONTROL
LOGIC
6
MISO
SHIFT REGISTER
CONTROL REGISTER
CE
8
SCK
INT
10
SUCCESSIVE APPROXIMATION
CONTROL LOGIC
OSCILLATOR
6
10-BIT CAPACITOR ARRAY
ADDRESS REGISTER
CAPACITOR SWITCH ARRAY
3
3
8
REFERENCE
ANALOG INPUTS
VDD
AI0*
AI7
NOTE: USED AS VOLTAGE INPUT IN
EXTERNAL REFERENCE MODE.
2
OSC
ANALOG MULTIPLEXER
STATUS
CONTROL
REGISTERS REGISTERS
VSS
12
CDP68HC68A2
Absolute Maximum Ratings
Thermal Information
DC Supply Voltage Range, (VDD) . . . . . . . . . . . . . . . . . -0.5V to +7V
(Voltage Referenced to VSS Terminal)
Input Voltage Range, All Inputs . . . . . . . . . . . . . -0.5V to VDD +0.5V
DC Input Current, Any One Input . . . . . . . . . . . . . . . . . . . . . . . .±10mA
Thermal Resistance (Typical, Note 2)
Operating Conditions
θJA (oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
90
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
100
Maximum Power Dissipation Per Package (PD)
TA = -40oC to 60oC (Package Type E) . . . . . . . . . . . . . . . 500mW
TA = 60oC to 85oC (Package Type E)
Derate Linearly at. . . . . . . . . . . . . . . . . . . 12mW/oC to 200mW
TA = -40oC to 70oC (Package Type M) (Note 3) . . . . . . . . 400mW
TA = -70oC to 85oC (Package Type M) (Note 3)
Derate Linearly at. . . . . . . . . . . . . . . . . . . 6.0mW/oC to 310mW
Device Dissipation Per Output Transistor . . . . . . . . . . . . . . . . 40mW
TA = Full Package Temperate Range (All Package Types)
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . 150oC
Maximum Storage Temperature Range (TSTG) . . . . . -65oC to 150oC
Maximum Lead Temperature (During Soldering). . . . . . . . . . . 265oC
At Distance 1/16 ±1/32 In. (1.59 ± 0.79mm)
From Case for 10s Max (SOIC - Lead Tips Only)
(Note 1)
Temperature Ambient, TA . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
DC Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . 3V Min, 6V Max
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. For maximum reliability, nominal operating conditions should be selected so that operation is always within the ranges specified.
2. θJA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
3. Printed circuit board mount: 58mm x 57mm minimum area x 1.6mm thick G10 epoxy glass, or equivalent.
TA = 25oC, VDD = 5V, Unless Otherwise Specified.
Electrical Specifications
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
ACCURACY
Differential Linearity Error
10-Bit Mode
-
±1.25
±2
LSB
Integral Linear Error
10-Bit Mode
-
±1.25
±2
LSB
Offset Error
10-Bit Mode
-1
3
4
LSB
Gain Error
10-Bit Mode
-1
1
2
LSB
Input Resistance
In Series with Sample Caps
-
85
-
Ω
Sample Capacitance
During Sample State
-
400
-
pF
Input Capacitance
During Hold State
-
20
-
pF
Input Current
At VIN = VREF + During Sample
During Hold or Standby State
-
+30
-
µA
-
-
±1
µA
VSS
-
VDD
+0.3
V
-
4.68
-
MHz
3.0
-
VDD
V
ANALOG INPUTS: AI0 THRU AI7
Input + Full Scale Range
From Input RC Time Constant
VR = 1
Input Bandwidth (3dB)
Input Voltage Range: AI0
DIGITAL INPUTS: MOSI, SCK, CE, TA = -40oC to 85oC
High Input Voltage
VIH
VDD = 3 to 6V
70
-
-
% of
VDD
Low Input Voltage
VIL
VDD = 3 to 6V
-
-
30
% of
VDD
-
-
±1
µA
-
-
10
pF
Input Leakage
TA = 25oC
Input Capacitance
3
CDP68HC68A2
TA = 25oC, VDD = 5V, Unless Otherwise Specified. (Continued)
Electrical Specifications
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
4.25
-
-
V
-
-
0.4
V
-
-
±10
µA
-
-
-1
MHz
DIGITAL OUTPUTS: MISO, INT, TA = -40oC to 85oC
High Level Output VOH, MISO
ISOURCE = 6mA
Low Level Output VOL, MISO, INT
ISINK = 6mA
Three-State Output Leakage IOUT, MISO, INT
TIMING PARAMETERS TA = -40oC to 85oC
Oscillator Frequency fSAMPLE
10-Bit Mode
Conversion Time
(Including Sample Time)
10-Bit Mode
14 Oscillator Cycles
8-Bit Mode
12 Oscillator Cycles
Sample Time (Pre-Encode)
8 Time Constants (8τ) Required
Serial Clock (SCK) Frequency
First 1.5 Oscillator ≥ 8τ
-
-
1.5
MHz
SCK Pulse Width TP
Either SCKA or SCKB
150
-
-
ns
MOSI Setup Time TDSU
Prior to Leading Edge of TP
60
-
-
ns
MOSI Hold Time TDH
After Leading Edge of TP
60
-
-
ns
MISO Rise and Fall Time
200pF Load
-
-
100
ns
MISO Propagation Delay TDOD
From Trailing SCK Edge
-
-
100
ns
IDD
VDD = 5V, Continuous Operation
-
1.4
2
mA
IDD
VDD = 3V, Continuous Operation
-
0.7
1.2
mA
4
CDP68HC68A2
Through this specification the CDP68HC68A2 is referred to
simply as the A2.
the reference voltage and AI0/EXT REF is treated as any
other analog input (see AI1-AI7).
Functional Pin Description
AI1-AI7 - Analog Inputs 1-7 (Inputs) - Together with
AI0/EXT REF, these pins provide the eight analog inputs
(channels) which are multiplexed within the CDP68HC68A2
to a single, high-speed, successive approximation, A/D
converter. AI1-AI7 must fall within the VSS and VDD supply
rails.
OSC - Oscillator (Input/Output) - This pin is user
programmable. In the “external” mode, the clock input for the
successive approximation logic is applied to OSC from an
external clock source. The input is a Schmitt trigger input
which provides excellent noise immunity. In the “internal”
mode, a capacitor is connected between this pin and a
power supply to form a “one pin oscillator”. The frequency of
the oscillator is inversely dependent on the capacitor value.
Differences in period, from one device to another, should be
anticipated. Systems utilizing the internal oscillator must be
tolerant of uncertainties in conversion times or provide
trimming capability on the OSC capacitor. See Table 2 for
typical frequencies versus capacitance.
INT - Interrupt (Open Drain Output) - INT is used to signal
the completion of an A/D conversion. This output is generally
connected, in parallel with a pullup resistor, to the interrupt
input of the controlling microprocessor. The open drain
feature allows wire-NOR’ing with other interrupt inputs. The
inactive state of INT is high impedance. When active, INT is
driven to a low level output voltage. The state of INT is
controlled and monitored by bits in the Mode Select and
Status Registers.
MISO - Master-In-Slave-Out (Output) - Serial data is
shifted out on this pin. Data is provided most significant bit
first.
MOSI - Master-Out-Slave-In (Input) - Serial data is shifted
in on this pin. Data must be supplied most significant bit first.
This is a CMOS input and must be held high or low at all
times to minimize device current.
SCK - Serial Clock (Input) - Serial data is shifted out on
MISO, synchronously, with each leading edge of SCK. Input
data from the MOSI pin is latched, synchronously, with each
trailing edge of SCK.
CE - Chip Enable (Input) - An active HIGH device enable.
CE is used to synchronize communications on the SPI lines
(MOSI, MISO, and SCK). When CE is held in a low state, the
SPI logic is placed in a reset mode with MISO held in a high
impedance state. Following a transition from low to high on
CE, the CDP68HC68A2 interprets the first byte transferred
on the SPI lines as an address. If CE is maintained high,
subsequent transfers are interpreted as data reads or writes.
AI0/EXT REF - Analog Input 0/External Reference
(Input) - This input is one of eight analog input channels. Its
function is selectable through the Mode Select Register
(MSR). If VR is set high in the MSR, AI0/EXT REF provides
an external voltage reference against which all other inputs
are measured. AI0/EXT REF must fall within the VSS and
VDD supply rails. If VR is set low in the MSR, VDD is used as
5
VSS - Negative Power Supply - This pin provides the
negative analog reference and the negative power supply for
the CDP68HC68A2.
VDD - Positive Power Supply - This pin provides the
positive power supply and, depending on the value of the VR
bit in the MSR, the positive analog reference for the
CDP68HC68A2.
Overview
From the programmer’s perspective, the A2 is comprised of
three control registers (Mode Select Register - MSR,
Channel Select Register - CSR, and Starting Address
Register - SAR), a status register (SR), an array of eight
pairs of Data Registers, and one non-addressable, internal
register (Channel Address Register). See Figure 1.
The A2 contains a high speed, 10-bit, successive
approximation, analog to digital converter (A/D). The input to
the A/D can be any one of the A2’s eight analog inputs (AI0
through AI7). The contents of the CAR determine which
analog input is connected to the A/D. The result of each
analog to digital conversion is written to the Data Register
array. The Data Register array is also addressed by the
contents of the CAR, providing a one to one correspondence
between each analog input and each Data Register pair.
The contents of the CAR are also used during Data Register
reads to address the Data Register array. The CAR is
automatically jammed with the correct address when an
Address/Control Byte is sent to the A2. A second means, to
initialize the CAR, is by writing to the SAR.
Normal procedure for programming the A2 is to first select
the desired hardware mode by writing to the MSR. The
“active” analog channels are then specified by writing to the
CSR (channels not selected in the CSR are skipped during
conversions and burst mode reads). Finally, a write to the
SAR initializes the CAR (designating the first channel to
convert) and initiates the A/D conversions.
Polling of the SR or hardware interrupts can be used to
determine the completion of conversions.
The converted data is read from the data registers. In eight
bit mode, a single register is read for each channel of
interest. In ten bit mode, two registers are read per channel.
CDP68HC68A2
$00
HIGH DATA REGISTER 0
$01
LOW DATA REGISTER 0
$0E
HIGH DATA REGISTER 7
$0F
LOW DATA REGISTER 7
AI0
OUT
A
TO
IN
D
DATA REGISTERS
8
AI1
TO
AI2
1
AI3
M
U
X
AI4
AI5
AI6
AI7
$10
MODE SELECT REGISTER
$11
CHANNEL SELECT REGISTER
$12
START ADDRESS REGISTER
$13
CHANNEL ADDRESS REGISTER
STATUS REGISTER
CONTROL/STATUS REGISTERS
FIGURE 1. A PROGRAMMER’S MODEL OF THE CDP68HC68A2
CE
TP
SCKa
SCKb
D7
D6
D5
D4
D3
D2
D1
D0
MOSI
MISO
(READ
ONLY)
Tdod
Tdsu
Tdh
FIGURE 2. TIMING DIAGRAM FOR SERIAL PERIPHERAL INTERFACE
Serial Communications
Hardware Interface
All communications between the A2 and the controlling
processor are carried out over the Serial Peripheral Interface
(SPI) bus lines (MOSI, MISO, SCK, and CE). The SPI bus is
directly compatible with the SPI facilities of CDP68HC05
microcontrollers. Data is transmitted over the MISO and
MOSI lines synchronous with SCK. Transfers are done most
significant bit first.
The A2 acts as a “slave” device. The controlling “master”
signals the A2 that a SPI transfer is to take place by raising
CE and clocking SCK. A single shift register is used for
transferring data in and out of the A2. Whenever CE and
SCK are activated, data is shifted from the master to the A2
over the Master-Out-Slave-In (MOSI) line and,
simultaneously, during read operations, data is shifted to the
master from the A2 over the Master-In-Slave-Out (MISO)
line. Note that SCK must be provided by the master for both
reads and writes.
6
To accommodate various hardware systems, the A2 can
shift data on either the rising or falling edge of SCK. The
“active” edge is automatically determined by the A2. At the
moment that CE is first brought to a high level, the state of
SCK is latched. This latched state determines the
interpretation of SCK. If SCK is low when CE is activated,
data is shifted out on MISO on each rising edge of SCK and
data is latched from MOSI on each falling edge of SCK (see
SCKa in Figure 2). If SCK is high when CE is activated, data
is shifted out on MISO on each falling edge of SCK and data
is latched from MOSI on each rising edge of SCK (see SCKb
in Figure 2).
Hardware Interfacing to CDP68HC05 Controllers
When interfacing the A2 to CDP68HC05 controllers, set
CPHA = 1 and CPOL = (0 or 1) in the SPI control register. Note
that SCK pulses are generated only when data is written to the
SPI Data Register in a CDP68HC05. Reading data from or
writing data to the A2 requires writing data to the SPI Data
Register. The data will be ignored by the A2 for read operations.
The read data is available to the CDP68HC05 in the SPI Data
Register when SPIF is true in the SPI Status Register.
CDP68HC68A2
Hardware Interfacing to Non-CDP68HC05
Controllers
Most popular microcontrollers have a synchronous
communications facility which can be adapted to work with
the A2. Those that don’t can be easily interfaced using port
lines to synthesize a SPI bus.
Software Interface
Reading and writing to the A2 can be performed in either
single byte or multiple byte (burst) modes. Both modes begin
the same way: a positive transition is applied to CE (if CE is
high, it must first be brought low, then returned high); an
address/control byte is transferred (requires 8 clocks on
SCK and 8 bits of data on MOSI); and the first byte of data is
transferred (requires 8 clocks of SCK). In the case of single
byte mode, the transfer is complete. For multiple byte
transfers, each series of 8 pulses on SCK produces another
8-bit transfer (see Figure 3).
the CSR) active channel’s Low Data Register. In the 10-bit
mode, following a read of a High Data Register, the address
is advanced to the Low Data Register of the same channel.
Reading the Low Data Register then increments the read
address to the next (as specified in the CSR) active channel’s High Data Register. Following a read of the last (closest
to 7) active channel’s Data Register(s), the address recycles
to the first (closest to 0) active channel’s Data Register(s).
When reading or writing control registers, the address will
increment to the next register after each transfer. Once
address $13 has been reached no more increments are
performed. This facilitates polling of the Status Register (SR)
which is located at address $13. If the A2 remains selected
following a read of SR, each successive 8 bit transfer will read
the SR again without; the need for an address /control byte.
Programming the CDP68HC68A2
Registers
Initializing the A2
The A2 is equipped with a power on reset circuit which
clears the MSR to all 0’s. This ensures that INT is in a high
impedance state and conversions are inhibited. The
contents of all other registers are unknown until explicitly
initialized. No other provisions are made for resetting the A2.
CE
ADDRESS BYTE
MOSI
DATA BYTE
HI - Z
MISO
TRANSFER CYCLE:
PHASE:
READ
1
I
HI - Z
2
II
Systems which can be reset after power up must reset the
A2 by explicitly writing 0’s to the MSR. Designs which utilize
the INT line must be certain that the MSR is cleared, or the
A2 is initialized to a known state, before enabling interrupts.
FIGURE 3A. SINGLE BYTE TRANSFER
(REQUIRES 2 SPI TRANSFERS)
NOTE: It is good practice to include code which initializes the A2, to
a known state, at the earliest practical point. In systems which utilize
INT, if a system reset occurs after power-up, A2 initialization code
must be executed before processor interrupts are enabled.
CE
MOSI
MISO
ADDRESS
BYTE
HI - Z
ADDRESS: WRITE ADDR: 1
TRANSFER CYCLE:
1
PHASE:
I
DATA
BYTE
DATA
DATA
Address/Control Byte
READ
DATA
ADDR: 1
2
II
READ
ADDR: 2
3
READ
HI - Z
ADDR: N
N+1
II
FIGURE 3B. MULTIPLE (N) BYTE TRANSFER
(EFFICIENT DEVICE COMMUNICATION REQUIRING N+1 SPI TRANSFERS)
The Address/Control Byte is a dual purpose word which
performs register addressing and read/write control. The
Address/Control Byte is the first byte transferred to the A2
following activation of CE. If CE is active, it must first be
brought low, then reactivated prior to transferring an
Address/Control Byte.
FIGURE 4. ADDRESS/CONTROL BYTE
The format of the address/control byte is shown in Figure 4.
The most significant bit is the R/W bit. When R/W is 0, read
operations are to be performed. If R/W is 1, write operations
are to be performed. A0 through A4 specify the register to
access. Data registers are mapped to address $00 through
$0F. The Control and Status Registers are at locations $10
through $13 (See Figure 1).
When transferring multiple bytes of data, the type of transfer
- read or write - is fixed by bit seven of the initial address/
control byte. After the initial data transfer, the address will
automatically be adjusted for each subsequent transfer.
When reading Data Registers in the 8-bit mode, each read
will advance the address by two, to the next (as specified in
7
R/W
-
-
A4
A3
A2
A1
A0
7
6
5
4
3
2
1
0
The most significant bit (MSB) of the Address/Control byte is
R/W. This bit is used to control the flow of data during the
subsequent SPI data transfers. If R/W is a 0, reads take
place. If R/W is a 1, writes take place. During read transfers,
data is shifted out on MISO. During writes, data is shifted in
on MOSI and MISO is held in a high impedance state.
The least significant five bits (A0 through A4) provide the
read address. Bits 5 and 6 are not required and can be sent
as either 0 or 1 (0’s are assembled throughout this
specification). When addressing Data Registers in 8-bit
CDP68HC68A2
mode, A0 is internally forced to a 1. Attempting to read a
High Data Register in 8-bit mode will result in a read of the
Low Data Register of the next active channel).
TABLE 1. CONVERSION MODES
M1
M2
MODE
0
0
0
Idle
0
1
1
Single Conversion
1
0
2
Single Scan
1
1
3
Continuous Scan
NOTE: CAUTION! When addressing Data Registers, the user must
ensure that the contents of the CAR match the address portion of the
Address/Control Byte. Failure to do so may result in corrupted data.
This condition is generally met in Modes 1 and 2. When running in
Mode 3 special care must be taken to meet this requirement. See
further explanation under SAR, SR, Modes, and Applications
Information.
DESCRIPTION
Channel Address Register (CAR)
Mode Select Register (MSR)
Address/Control: (R/W)0010000 - $10
Address/Control: Not Addressable
Read/Write: Yes
The CAR contains the address of the next channel to
convert during Modes 1, 2, and 3. During multiple byte reads
of the Data Registers, the CAR contains the address of the
channel to read and is advanced, to the next higher active
channel, following each read. When advancing, the CAR
skips any channel not selected in the CSR. After
incrementing to the highest active channel, the CAR will
return to the lowest active channel.
7
6
5
4
3
2
1
0
0
0
EXT
VR
M8
IE
M1
M0
$10
The read/write register is used to select the various modes
of operation of the A2. Bits 6 and 7 are “don’t cares” and can
be set as either 1 or 0. The functions of bits 0 through 5 are
as follows:
B5, EXT
The External Oscillator bit (EXT) is used to
select between an external or an internal (single
pin oscillator) clock source at pin 1 (OSC) of the
A2. If EXT is low, an external clock is selected
and the OSC pin functions as an input. If EXT is
high, an internal clock is selected and the OSC
pin functions as a one pin oscillator. See Table 2
for typical frequencies of the internal oscillator.
B4, VR
The Voltage Reference (VR) bit is used to select
the source of the voltage reference. When VR is
0, VDD is used as the full scale reference for the
A/D converter. When VR is 1, the voltage at AI0
serves as the full scale reference for the A/D
converter. When VR = 1, the digital reading of
any active channel which exceeds the AI0 reference voltage will be “clipped” to the full scale
value of $3FF ($FF for 8-bit mode).
B3, M8
The Eight Bit Mode (M8) bit selects either 10-bit
or 8-bit as the mode of operation. A low (0) in
this bit enables the 10-bit mode, while a high (1)
enables the 8-bit mode.
B2, IE
The Interrupt Enable (IE) bit is used to enable
the INT output function on pin 2. A low (0) disables the interrupt function and maintains INT in
a high impedance state. A high enables the
interrupt function, allowing INT to be driven low
at the appropriate times in Modes 1 and 2.
B1, M1
Mode Select, bit 1. This bit is used along with
M0 to select the conversion mode, shown in
Table 1, of the A/D converter.
B0, M0
Mode Select, bit 0. This bit is used along with
M1 to select the conversion mode, shown in
Table 1, of the A/D converter.
8
The CAR is not directly accessible. It can be jammed via a
write to the SAR or by transmitting an Address/Control Byte
which addresses any Data Register. Note: addressing a
Data Register to set the CAR is valid only under certain
circumstances - see the following boxed caution. When
jamming the CAR via the SAR, the specified channel does
not need to be selected in the CSR. The CAR’s contents are
read as part of the SR. See the descriptions of the SAR and
the SR for details.
NOTE: CAUTION! When addressing Data Registers, the user must
ensure that the contents of the CAR match the address portion of the
Address/Control Byte. Failure to do so may result in corrupted data.
This condition is generally met in Modes 1 and 2. When running in
Mode 3 special care must be taken to meet this requirement. See
further explanation under SAR, SR, Modes, and Applications
Information.
Channel Select Register (CSR)
Address/Control: (R/W)0010001 - $11
Read/Write: Yes
7
6
5
4
3
2
1
0
C7
C6
C5
C4
C3
C2
C1
C0
$11
This read/write register is used to designate the active
analog input channels. Channels which are not active will be
skipped during conversions and multiple byte reads, unless
specifically selected by writing to the SAR. Setting a bit high
in CSR selects the associated channel, while setting a bit
low deselects the channel. Each Cn bit in the CSR
corresponds to an AIn pin on the A2 device. Example:
setting C7 = C4 = 1 and setting all other bits to 0 will select
AI7 and AI4 as inputs to the A/D multiplexer.
CDP68HC68A2
Starting Address Register (SAR)
B1, CA0
Channel Address, bit 0. See discussion under
CA2.
B0, H/L
High/Low. For most applications, the SAR
should be written with H/L as a 0. In combination
with CA2, CA21, and CA0, this bit is used to
select a specific High or Low Data Register. H/L
only has significance in 10-bit mode. The 10-bit
read sequence is High Data Register followed
by Low Data Register for each channel read.
When jamming the CAR prior to reads, H/L
should be set low, unless the user specifically
wants to skip the first High Data Register. When
read, this bit, indicates whether the next Data
Register read will access the High or Low Data
Register. In 8-bit mode, H/L is ignored by the A2.
Address/Control: (R/W)0010010 - $12
Read/Write: Yes
7
6
5
4
3
2
1
0
ENC
0
0
SAE
CA2
CA1
CA0
H/L
$12
This register is used to enable conversions in all modes and
to set the address of the current channel in the CAR. Prior
to, or simultaneously with, enabling conversions, the CAR
must be set to a known state via the SAR. Once set, the
contents of the CAR determine the first channel to be
converted when conversions are enabled - hence the name
“Starting Address Register”. The CAR may be jammed with
the number of a channel which is not selected in the CSR.
After the specified channel is converted, subsequent
conversions proceed in ascending order, skipping channels
not selected in the CSR. Therefore, jamming the CAR with a
non-selected channel number will cause a conversion to be
performed on that channel once and only once.
After stopping a Mode 2 or 3 conversion (by setting ENC low),
the CAR must be jammed to match the channel address prior
to initiating Data Register reads. If an Address/Control Byte is
sent to begin reads from a Data Register other than the one
currently addressed by the CAR, the contents of the Data
Register may be corrupted. If the CAR contents are known,
single or multiple byte reads can be properly made, by
sending a matching Address/Control Byte.
Bits 5 and 6 in the SAR are “don’t cares” and can be set to
either 0’s or 1’s. The functions of the remaining bits are as
follows:
B7, ENC
The Enable Conversions (ENC) bit is used to
synchronously switch on and off the successive
approximation A/D converter. When this bit is
set high, the appropriate conversion operation
(as defined in the MSR) is initiated. Setting the
ENC bit low stops the conversion operation. If a
channel is being converted when ENC is
cleared, the conversion of that channel will complete and further conversions will be inhibited.
B4, SAE
Starting Address Enable (SAE). If the SAR is
written to, with the SAE bit high, the CAR is
jammed with the value defined by CA2, CA1,
and CA0. If SAE is low, the CA2, CA1, and CA0
bits are ignored.
B3, CA2
Channel Address, bit 2. When writing to the
SAR with SAE high, CA2, CA1, and CA0 form a
3-bit channel address which is used to set the
CAR and select the first channel to be converted
or read. Reading the SAR returns the previously
written values for these three bits. To determine
the contents of the CAR a read of the Status
Register (SR) must be performed.
B2, CA1
Channel Address, bit 1. See discussion under
CA2.
9
Status Register (SR)
Address/Control: 00010011 - $13
Read/Write: Read Only
7
6
5
4
3
2
1
0
INT
ACC
CIP
0
CA2
CA1
CA0
0
$13
This is a read only register used to monitor the status of the
A/D converter. If an Address/Control Byte of $13 is sent to
the A2, the Status Register will be addressed and will remain
addressed until the CE pin is brought low. This provides
efficient polling of the SR by allowing multiple reads of the
SR with only one Address/Control Byte transmission.
Bits 0 and 4 of the SR are always read as lows. The
significance of each of the other bits is:
B7, INT
Interrupt. In Modes 1 and 2, this bit is set high
under the same conditions that the INT pin
would be activated (see Conversion Modes).
Once set, the INT bit can be cleared by reading
the SR, reading any Data Register, or writing to
the MSR or CSR. The INT bit is not affected by
the state of the IE bit in the MSR.
B6, ACC
All Conversions Complete bit. When high, this
status bit indicates that conversions have been
completed on all channels selected in the CSR.
It is cleared by reading any of the Data Registers
or by writing to the MSR or CSR. In 10-bit mode,
ACC = 1 implies that the DV bits of all active
channels are true (see Data Registers). This bit
is often used in Modes 2 and 3. In Mode 1, ACC
will only be set if conversions are explicitly
invoked (via writes to the SAR) for each channel
selected in the CSR.
B5, CIP
Conversion In Progress bit. This bit is logically
high when a conversion is initiated and goes low
when a conversion completes. In the scanning
modes, Modes 2 and 3, CIP will go low momentarily between successive channels and cannot
be used in lieu of ACC in Mode 2.
CDP68HC68A2
NOTE: Following a write of $00 to the SAR, to
terminate Mode 3 conversions, CIP may remain
high until cleared with a write to the MSR or the
CSR or with the read of a Data Register or with a
write to the SAR with ENC or SAE = 1. CIP = 1
is not a true indication of an ongoing conversion.
See “Mode 3 - Continuous Scan”
B3, CA2
Two status flags are maintained for each channel. In 10-bit
mode these status flags are provided in the High Data
Register. In 8-bit mode they are not available to the user.
Their functions are:
B7, DV
Channel Address Register, bit 2. CA2, CA1, and
CA0 form a three bit binary number that indicates the current contents of the CAR. The CAR
is originally set by the user via the SAR (see
SAR). The CAR is automatically incremented
following reads of Data Registers and following
conversions in the scanning modes (Modes 2
and 3). The Status Register can be read at any
time. Reading CA2 - CA0 during Modes 2 and 3
will produce changing channel addresses as the
conversions proceed.
B2, CA1
Channel Address, bit 1. See discussion under
CA2.
B1, CA0
Channel Address, bit 0. See discussion under
CA2.
Data Registers
Address/Control: 0000000 to 0000111 - $00 to $0F
The Data Valid bit indicates whether the corresponding channel has been converted since it
was last read. DV is set upon completion of a
conversion on the corresponding channel. DV is
cleared by reading the Data Register or by a
write to the MSR or the CSR.
NOTE: A write to the SAR does not clear the DV flag
for each channel. This implies that if: conversion are
completed on all registers selected in CSR; conversions stopped; an incomplete read of the Data Registers is performed; and conversions reinitiated with a
write to the SAR - some DVs will still be set. In Mode
2, which terminates when all DVs are true (ACC goes
true), unread channels may not be converted, unless
CSR is written to, before setting ENC.
B6, DOV
The Data Overrun (DOV) bit indicates that more
than one conversion has been performed on a
channel since it was last read. This bit is only
valid in Modes 1 and 3. DOV is cleared by reading the Data Register or by performing a write to
the CSR or the MSR.
Conversion Modes of the CDP68HC68A2
Read/Write: Read Only
Mode 0 - Idle
High
H/L = 0
DV
DOV
0
0
0
0
D9
D8
7
6
5
4
3
2
1
0
Low
H/L = 1
D7
D6
D5
D4
D3
D2
D1
D0
7
6
5
4
3
2
1
0
The Data Registers are used to store the results of A/D
conversions. There are two registers, a High Data Register
and a Low Data Register, associated with each channel.
In 8-bit mode, the High Data Registers are inaccessible, and
each Low Data Register holds the 8-bit result of the most
recent conversion of its associated channel. The values
range from $00 (AIn = VSS) to a full scale reading of $FF.
During multiple byte Data Register reads, the address (held
in the CAR) is advanced to the Low Data Register of the next
active channel (as specified in the CSR) following each read.
In 10-bit mode, bits 0 and 1 of the High Data Register
together with the contents of the Low Data Register hold the
result of the most recent conversion to the associated
channel. The values range from $000 (AIn = VSS) to a full
scale reading of $3FF. During multiple byte Data Register
reads, the address (held in the CAR) is automatically
advanced from the High Data Register to the Low Data
Register. Following a read of the Low Data Register, the
address advances to the High Data Register of the next
active channel (as specified in the CSR).
10
On power_up, the MSR is reset to all 0’s placing the A2 into
Mode 0. After power_up, the user can effectively reset the
A2 by selecting Mode 0 via the MSR. Setting the A2 to Mode
0, at any time, will abort any current conversions and force
the INT pin to a high impedance state. In mode 0, if EXT is
high in the MSR, the one pin, internal oscillator is placed in a
low power, shutdown mode and internal clocking of the A/D
converter is inhibited. If EXT is low in the MSR, internal
clocking of the A/D converter is inhibited.
Mode 1 - Single Conversion
In Mode 1, conversions are performed on command. After
setting Mode 1 in the MSR, a write to the SAR with ENC high
will initiate a conversion on the channel currently selected by
the CAR. Note: this channel does not have to be active in the
CSR. When using the internal oscillator, the oscillator is
enabled. The CIP flag in the SR will be set when the conversion
begins.
Upon completion of the conversion, the INT bit in the SR will
be set, the CIP flag will cleared, and, if IE is true in the MSR,
the INT pin will be driven low (if all channels specified in the
CSR have been converted since the last Data Register read
the ACC bit in the SR will also be set). Finally, if it’s active,
the internal oscillator will be stopped.
Another conversion can be initiated with a write to the SAR.
However, the normal procedure is to read the results of the
first conversion. This does two things: first it clears the INT
flag (the INT pin is returned to a high impedance state);
CDP68HC68A2
second a conversion is automatically started on the next
channel selected in the CSR. This read-convert pattern can
be continued indefinitely.
When reading Data Registers in Mode 1, the user can be
certain that the contents of the CAR equal the channel
number which was just converted. Thus the Address/Control
Byte sent prior to the read will automatically match the CAR.
If a read from a Data Register, other than the one just
converted, is performed, the CAR must be set to the desired
register prior to sending the Address/Control Byte. Setting
CAR is done by writing the SAR with ENC = 0, SAE = 1, and
the CA2 - CA0 bits equal to the desired channel.
Mode 2 - Single Scan
In mode 2, when ENC is set in the SAR, conversions are
performed on all channels selected in the CSR. Conversions
begin on the channel specified by the CAR (this channel does
not have to be active in the CSR) and proceed in ascending
order until all channels selected in the CSR have been
converted. If the starting channel is not the lowest active
channel, when the highest active channel is done converting,
the CAR advances to the lowest active channel and continues
from that point until all channels have been converted once.
When ENC is set i n the SAR, the internal clock is activated
(if selected), the CIP flag is set in the SR, and conversions
begin. The CIP flag doesn’t remain high, as it momentarily
goes low between each channel conversion.
When all channels have been converted the INT and ACC
flags in the SR are set, the INT pin is driven low (if IE is true
in the MSR), the CIP flag is cleared, and, if active, the
internal oscillator is disabled.
Data Registers can safely be read after all channels have
been converted. If the starting channel was a channel active
in the CSR then the CAR will one again be pointing to that
channel (providing all channels had been read or CSR or
MSR written since the last set of conversions - see Note
below). IF a read from a Data Register, other than the one
first converted, is performed, the CAR must be set to the
desired register prior to sending the Address/Control Byte.
Setting CAR is done by writing the SAR with ENC = 0,
SAE = 1, and the CA2 - CA0 bits equal to the desired
channel.
NOTE: A write to the SAR does not clear the DV flag for each
channel. This implies that if: conversions are completed on all
registers selected in CSR; conversions stopped; an incomplete read
of the Data Registers is performed; and conversions reinitiated with
a write to the SAR - some DVs will still be set. In Mode 2, which
terminates when all DVs are true (ACC goes true), unread channels
may not be converted unless CSR is written to before setting ENC.
There are two ways to prematurely stop conversions in Mode
2. The first is to perform any “abort” action (see Abort Modes).
Performing an abort, may produce spurious conversion
values. The second, and preferred means to stop a Mode 2
conversion, is to clear the ENC bit by writing a $00 to the
11
SAR. Clearing ENC will synchronously stop conversions at
the end of the current conversion. When prematurely stopping
conversions, CIP is not valid. The CIP flag cannot be used to
determine when the current conversion is complete. Instead,
a time delay equal to one conversion time must be built into
the software. The appropriate delay will ensure the last
conversion is complete before Data Register reads begin.
Prematurely stopping the conversions leaves the CAR in an
unknown state. One remaining task, before Data Registers
are read, is to be certain the contents of the CAR match the
address sent in the Address/Control Byte. This is done by
jamming the CAR with a write to the SAR with ENC = 0,
SAE = 1, CA3 - C A2 - CA0 equal to the desired channel
address.
Mode 3 - Continuous Scan
In Mode 3, when ENC is set in the SAR, conversions are
performed on all channels selected in the CSR. COnversion
begin on the channel specified by the CAR (this channel
does not have to be active in the CSR) and proceed in
ascending order for all channels selected in the CSR. Each
time the highest active channel is done converting, the CAR
advances to the lowest active channel and continues from
that point.
When ENC is set in the SAR, the internal clock is activated
(if selected) and conversions begin.
When all channels have been converted one time the ACC
flag in the SR is set. This is the only valid status flag in Mode
3. The CIP flag is not valid in Mode 3. The INT flag and the
INT pin are both held in a disabled state during Mode 3.
Data Registers cannot be read until Mode 3 conversions
have been terminated. There are two ways to stop
conversions in Mode 3. The first is to perform any “abort”
action (see Abort Modes). Performing an abort, may produce
spurious conversion values. The second, and preferred
means to stop a Mode 3 conversion, is to clear the ENC bit
by writing a $00 to the SAR. Clearing ENC will
synchronously stop conversions at the end of the current
conversion. CIP is not valid following the clearing of ENC.
The CIP flag cannot be used to determine when the current
conversion is complete. Instead, a time delay equal to one
conversion time must be built into the software. The
appropriate delay will ensure the last conversion is complete
before Data Register reads begin.
The Data Registers can safely be read after ENC is cleared
and one conversion time has elapsed. One remaining task is
to be certain the contents of the CAR match the address
sent in the Address/Control Byte. This is done by jamming
the CAR with a write to the SAR with ENC = 0, SAE = 1, and
CA2 - CA0 equal to the desired channel address.
Abort Modes
Any active mode can be aborted by any one of the following
means:
CDP68HC68A2
1. A write to the MSR
VCC
2. A write to the CSR
3. A write to the SAR with ENC and/or SAE = 1
4. A read of any Data Register
The contents of Data Registers are not guaranteed following
an abort. Writing a $00 to the MSR is equivalent to a reset.
To synchronously stop conversions in Modes 2 or 3 set the
SAR to $00 (See Mode 2 and Mode 3).
Analog Inputs
Shown in Figure 5 is a simplified equivalent circuit
representing the input to the Analog to Digital Converter
through the multiplexer as seen from each AIn pin.
Due to the nature of the switched capacitor array used by the
successive approximation A/D, two important points are
noted here:
A property of capacitive input is the intrinsic sample and
hold function. This provides all that is necessary to
accurately sample a point on an input waveform within the
input bandwidth shown in the specifications (under 1.5
conversion oscillator cycles).
The input to the capacitor network appears as an RC
network with a time constant and therefore places
constraints on the source impedance. The charging time and
therefore the accuracy of the conversion will be adversely
affected by increasing the source impedance.
It is recommended to set the conversion oscillator frequency
in accordance with the input impedance in order to allow
sufficient time (the 1.5 TOSC cycles) to sample a changing
waveform through the modeled input low pass filter network
which includes the input source in a series circuit with the
internal impedance.
VCC
D1
R1
85Ω
SIGNAL
INPUT
C1
400pF
V1
V 2.5V
D2
FIGURE 5A. ANALOG INPUT DURING SAMPLE TIME
12
D1
SIGNAL
INPUT
OPEN
CIRCUIT
D2
FIGURE 5B. ANALOG INPUT DURING HOLD AND IDLE TIME
The time constant (τ) for the input network is REFFCNET.
R EFF = R S + R NET, C NET = 400pF, and R NET = 50Ω.
τ = R EFF C NET = ( R S + 50Ω ) 400pF.
8τ is required during the first 1.5 sample clock cycles to
sufficiently encode 10-bit conversion. Therefore, 1.5 TS ≥ 8τ
and TS ≥ 5.33 REFFC.
TS = 1/f SAMPLE ,
then f SAMPLE ≤[ 5.33 ( R S + 85Ω ) 400pF ] – 1,
8
f SAMPLE ≤ ( 4.688 × 10 ) ⁄ ( R S + 85Ω ) .
For example, if RS = 1000, fSAMPLE must be less than
432kHz, and TS = 2.3µs. This yields a 10-bit conversion time
of 32µs. An internal COSC ≥ 68pF, see chart.
The maximum frequency is limited by the device
specification (see characteristics) and by the (RS) Series
input resistance:
8
R S ≤ [ ( 4.688 × 10 "" )/f SAMPLE , ] – 85Ω.
For example, for a 1MHz sample clock RS max = 385Ω.
CDP68HC68A2
The Internal Schmitt Oscillator
Figure 6 shows a simplified model of the Schmitt oscillator
used to help familiarize the user with its operation. Table 2
shows typical internal oscillator frequency versus
capacitance at 5V and 25oC.
TABLE 2. TYPICAL OSCILLATOR FREQUENCY vs
CAPACITANCE AT VDD = 5V, TA = 25oC
C(pF)
f(MHz)
C(pF)
f(MHz)
18
1.0 - 3.0
218
0.148 - 0.40
38
0.65 - 2.0
318
0.111 - 0.25
48
0.54 - 1.6
409
0.107 - 0.23
68
0.38 - 1.1
528
0.072 - 0.17
118
0.26 - 0.75
1018
0.040 - 0.10
When measuring the oscillator, probe capacitance will affect
frequency. An alternative to direct frequency measurement
of the oscillator input is to measure the interval between
successive interrupts in modes 1 and 2.
VDD
CONTROL
PMOS
Q3
D1
N1
I1
200µA
OSCILLATOR
INPUT
OSC
HYSTERESIS
I2
COMPARATOR
200µA
D2
EXTERNAL
CAP
330pF
NMOS
Q4
N2
CONTROL
VSS
FIGURE 6. EQUIVALENT CIRCUIT FOR OSCILLATOR INPUT
13
CDP68HC68A2
Dual-In-Line Plastic Packages (PDIP)
E16.3 (JEDEC MS-001-BB ISSUE D)
16 LEAD DUAL-IN-LINE PLASTIC PACKAGE
N
E1
INDEX
AREA
1 2 3
INCHES
N/2
-B-
-AE
D
BASE
PLANE
-C-
SEATING
PLANE
A2
A
L
D1
e
B1
D1
A1
eC
B
0.010 (0.25) M
C A B S
MILLIMETERS
SYMBOL
MIN
MAX
MIN
MAX
NOTES
A
-
0.210
-
5.33
4
A1
0.015
-
0.39
-
4
A2
0.115
0.195
2.93
4.95
-
B
0.014
0.022
0.356
0.558
-
C
L
B1
0.045
0.070
1.15
1.77
8, 10
eA
C
0.008
0.014
C
D
0.735
0.775
D1
0.005
-
0.13
-
5
E
0.300
0.325
7.62
8.25
6
E1
0.240
0.280
6.10
7.11
5
eB
NOTES:
1. Controlling Dimensions: INCH. In case of conflict between English and
Metric dimensions, the inch dimensions control.
e
0.100 BSC
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
eA
0.300 BSC
3. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of
Publication No. 95.
eB
-
4. Dimensions A, A1 and L are measured with the package seated in JEDEC seating plane gauge GS-3.
L
0.115
N
5. D, D1, and E1 dimensions do not include mold flash or protrusions.
Mold flash or protrusions shall not exceed 0.010 inch (0.25mm).
6. E and eA are measured with the leads constrained to be perpendicular to datum -C- .
7. eB and eC are measured at the lead tips with the leads unconstrained.
eC must be zero or greater.
8. B1 maximum dimensions do not include dambar protrusions. Dambar
protrusions shall not exceed 0.010 inch (0.25mm).
9. N is the maximum number of terminal positions.
10. Corner leads (1, N, N/2 and N/2 + 1) for E8.3, E16.3, E18.3, E28.3,
E42.6 will have a B1 dimension of 0.030 - 0.045 inch (0.76 - 1.14mm).
14
0.204
16
0.355
18.66
19.68
5
2.54 BSC
-
7.62 BSC
6
0.430
-
0.150
2.93
16
10.92
7
3.81
4
9
Rev. 0 12/93
CDP68HC68A2
Small Outline Plastic Packages (SOIC)
M20.3 (JEDEC MS-013-AC ISSUE C)
N
INDEX
AREA
0.25(0.010) M
H
20 LEAD WIDE BODY SMALL OUTLINE PLASTIC PACKAGE
B M
E
INCHES
-B-
1
2
3
L
SEATING PLANE
-A-
h x 45o
A
D
-C-
e
µα
A1
B
0.25(0.010) M
C
0.10(0.004)
C A M
B S
NOTES:
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2
of Publication Number 95.
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
MILLIMETERS
SYMBOL
MIN
MAX
MIN
MAX
NOTES
A
0.0926
0.1043
2.35
2.65
-
A1
0.0040
0.0118
0.10
0.30
-
B
0.013
0.0200
0.33
0.51
9
C
0.0091
0.0125
0.23
0.32
-
D
0.4961
0.5118
12.60
13.00
3
E
0.2914
0.2992
7.40
7.60
4
e
0.050 BSC
1.27 BSC
-
H
0.394
0.419
10.00
10.65
-
h
0.010
0.029
0.25
0.75
5
L
0.016
0.050
0.40
1.27
6
8o
0o
N
α
20
0o
20
7
8o
Rev. 0 12/93
3. Dimension “D” does not include mold flash, protrusions or gate
burrs. Mold flash, protrusion and gate burrs shall not exceed
0.15mm (0.006 inch) per side.
4. Dimension “E” does not include interlead flash or protrusions.
Interlead flash and protrusions shall not exceed 0.25mm (0.010
inch) per side.
5. The chamfer on the body is optional. If it is not present, a visual
index feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. The lead width “B”, as measured 0.36mm (0.014 inch) or greater
above the seating plane, shall not exceed a maximum value of
0.61mm (0.024 inch)
10. Controlling dimension: MILLIMETER. Converted inch
dimensions are not necessarily exact.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
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15
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1006 Lausanne
Switzerland
TEL: +41 21 6140560
FAX: +41 21 6140579
ASIA
Intersil Corporation
Unit 1804 18/F Guangdong Water Building
83 Austin Road
TST, Kowloon Hong Kong
TEL: +852 2723 6339
FAX: +852 2730 1433