DATASHEET

ISL90843
T
ODUC
T
TE PR
E
ODUC
L
R
O
P
S
E
T
OB
U
IT
BST
LE SU L90841 Data Sheet
IS
POSSIB
Quad Digital Controlled Potentiometers (XDCP™)
March 29, 2006
Low Noise, Low Power, I2C® Bus,
256 Taps
FN8095.2
Features
• Four potentiometers in one package
The ISL90843 integrates four digitally controlled
potentiometers (XDCP) on a monolithic CMOS integrated
circuit.
• 256 resistor taps–0.4% resolution
• I2C serial interface
- Two address pins allow up to four devices/bus
The digitally controlled potentiometers are implemented with
a combination of resistor elements and CMOS switches. The
position of the wipers are controlled by the user through the
I2C bus interface. Each potentiometer has an associated
Wiper Register (WR) that can be directly written to and read
by the user. The contents of the WR controls the position of
the wiper.
• Wiper resistance: 70 typical @ 3.3V
• Standby current <5µA max
• Power supply: 2.7V to 5.5V
• 10k or 50k total resistance
• 10 Ld MSOP package
The DCPs can be used as a voltage divider in a wide variety
of applications including control, AC measurement, and
signal processing.
• Pb-free plus anneal product (RoHS compliant)
Pinout
ISL90843
(10 LD MSOP)
TOP VIEW
RW3
1
10
RW0
SCL
2
9
VCC
SDA
3
8
A1
GND
4
7
A0
RW2
5
6
RW1
Ordering Information
PART NUMBER
(Note)
PART MARKING
RESISTANCE OPTION
(k)
TEMP RANGE
(°C)
PACKAGE
(Pb-Free)
ISL90843WIU1027Z*
DET
10
-40 to +85
10 Ld MSOP
ISL90843UIU1027Z*
DES
50
-40 to +85
10 Ld MSOP
*Add "-TK" suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL90843
Functional Diagram
VCC
RH
RH
RH
RH
SCL
SDA
I2C
INTERFACE
A0
A1
RL
GND
RW0
RL
RL
RL
RW1
RW2
RW3
Block Diagram
VCC
I2C
INTERFACE
SDA
SCL
WR3
DCP3
RW3
WR2
DCP2
RW2
WR1
DCP1
RW1
WR0
DCP0
RW0
POWER-UP,
INTERFACE,
CONTROL AND
STATUS LOGIC
A1
A0
GND
Pin Descriptions
MSOP PIN
SYMBOL
1
RW3
“Wiper” terminal of DCP3
2
SCL
I2C interface clock
3
SDA
Serial data I/O for the I2C interface
4
GND
Device ground pin
5
RW2
“Wiper” terminal of DCP2
6
RW1
“Wiper” terminal of DCP1
7
A0
Device address for the I2C interface
8
A1
Device address for the I2C interface
9
VCC
Power supply pin
10
RW0
“Wiper” terminal of DCP0
2
DESCRIPTION
FN8095.2
March 29, 2006
ISL90843
Absolute Maximum Ratings
Recommended Operating Conditions
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Voltage at any Digital Interface Pin
with Respect to GND . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC+0.3
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V
Voltage at any DCP Pin with
Respect to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC
Lead Temperature (Soldering, 10s) . . . . . . . . . . . . . . . . . . . . . 300°C
IW (10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6mA
Industrial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Power Rating of each DCP . . . . . . . . . . . . . . . . . . . . . . . . . . . .5mW
Wiper Current of each DCP . . . . . . . . . . . . . . . . . . . . . . . . . . ±3.0mA
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.
Analog Specifications
SYMBOL
Over recommended operating conditions unless otherwise stated.
PARAMETER
RTOTAL
TEST CONDITIONS
RH to RL Resistance
MIN
W, U versions respectively
RH to RL Resistance Tolerance
TYP
(NOTE 1)
Wiper Resistance
CW
Potentiometer Capacitance (Note 15)
UNITS
10, 50
-20
RW
MAX
VCC = 3.3V @ 25°C
k
+20
%
70

25
pF
VOLTAGE DIVIDER MODE (0V @ RLi; VCC @ RHi; measured at RWi, unloaded; i = 0, 1, 2, or 3)
INL (Note 6)
Integral Non-Linearity
DNL (Note 5) Differential Non-Linearity
ZSerror
(Note 3)
Zero-Scale Error
FSerror
(Note 4)
Full-Scale Error
VMATCH
(Note 7)
DCP to DCP Matching
Monotonic over all tap positions
TCV (Note 8) Ratiometric Temperature Coefficient
-1
1
LSB
(Note 2)
-0.5
0.5
LSB
(Note 2)
LSB
(Note 2)
W option
0
1
7
U option
0
0.5
2
W option
-7
-1
0
U option
-2
-1
0
Any two DCPs at same tap position, same
voltage at all RH terminals, and same voltage at
all RL terminals
-2
DCP register set to 80 hex
LSB
(Note 2)
2
LSB
(Note 2)
±4
ppm/°C
Operating Specifications Over the recommended operating conditions unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
(NOTE 1)
MAX
UNITS
= 400kHz; SDA = Open; (for I2C, Active,
ICC1
VCC Supply Current
(Volatile write/read)
10k DCPs, fSCL
Read and Write States)
3.8
mA
ICC2
VCC Supply Current
(Volatile write/read)
50k DCPs, fSCL = 400kHz; SDA = Open; (for I2C, Active,
Read and Write States)
2.9
mA
VCC current (standby)
VCC = +5.5V, 10k DCPs, I2C Interface in Standby State
2.8
mA
VCC = +5.5V, 50k DCPs, I2C Interface in Standby State
0.6
mA
VCC = +3.6V, 10k DCPs, I2C Interface in Standby State
1.9
mA
VCC = +3.6V, 50k DCPs, I2C Interface in Standby State
0.4
mA
10
µA
1
µs
2.6
V
ISB
ILkgDig
tDCP
(Note 15)
Vpor
Leakage Current, at Pins A0, A1, Voltage at pin from GND to VCC
SDA and SCL Pins
DCP Wiper Response Time
SCL falling edge of last bit of DCP Data Byte to wiper
change
Power-On Recall Voltage
Minimum VCC at which memory recall occurs
3
-10
1.8
FN8095.2
March 29, 2006
ISL90843
Operating Specifications Over the recommended operating conditions unless otherwise specified. (Continued)
SYMBOL
VccRamp
PARAMETER
TEST CONDITIONS
VCC Ramp Rate
MIN
TYP
(NOTE 1)
MAX
0.2
tD (Note 15) Power-Up Delay
VCC above Vpor, to DCP Initial Value Register recall
completed, and I2C Interface in Standby State.
UNITS
V/ms
3
ms
SERIAL INTERFACE SPECS
VIL
A1, A0, SDA, and SCL Input
Buffer LOW Voltage
-0.3
0.3*VCC
V
VIH
A1, A0, SDA, and SCL Input
Buffer HIGH Voltage
0.7*VCC
VCC+0.3
V
Hysteresis SDA and SCL Input Buffer
(Note 15) Hysteresis
VOL
(Note 15)
SDA Output Buffer LOW Voltage,
Sinking 4mA
Cpin
(Note 15)
V
0.05*
VCC
0.4
V
A1, A0, SDA, and SCL Pin
Capacitance
10
pF
SCL Frequency
400
kHz
tIN
(Note 15)
Pulse Width Suppression Time at Any pulse narrower than the max spec is suppressed.
SDA and SCL Inputs
50
ns
tAA
(Note 15)
SCL Falling Edge to SDA Output SCL falling edge crossing 30% of VCC, until SDA exits
the 30% to 70% of VCC window.
Data Valid
900
ns
tBUF
(Note 15)
Time the Bus Must be Free Before SDA crossing 70% of VCC during a STOP condition, to
the Start of a New Transmission SDA crossing 70% of VCC during the following START
condition.
1300
ns
tLOW
Clock LOW Time
Measured at the 30% of VCC crossing.
1300
ns
tHIGH
Clock HIGH Time
Measured at the 70% of VCC crossing.
600
ns
tSU:STA
START Condition Setup Time
SCL rising edge to SDA falling edge. Both crossing 70%
of VCC.
600
ns
tHD:STA
START Condition Hold Time
From SDA falling edge crossing 30% of VCC to SCL
falling edge crossing 70% of VCC.
600
ns
tSU:DAT
Input Data Setup Time
From SDA exiting the 30% to 70% of VCC window, to
SCL rising edge crossing 30% of VCC.
100
ns
tHD:DAT
Input Data Hold Time
From SCL rising edge crossing 70% of VCC to SDA
entering the 30% to 70% of VCC window.
0
ns
tSU:STO
STOP Condition Setup Time
From SCL rising edge crossing 70% of VCC, to SDA
rising edge crossing 30% of VCC.
600
ns
tHD:STO
STOP Condition Hold Time for
Read, or Volatile Only Write
From SDA rising edge to SCL falling edge. Both crossing
70% of VCC.
600
ns
tDH
(Note 15)
Output Data Hold Time
From SCL falling edge crossing 30% of VCC, until SDA
enters the 30% to 70% of VCC window.
0
ns
tR
(Note 15)
SDA and SCL Rise Time
From 30% to 70% of VCC
20 +
0.1 * Cb
250
ns
tF
(Note 15)
SDA and SCL Fall Time
From 70% to 30% of VCC
20 +
0.1 * Cb
250
ns
Cb
(Note 15)
Capacitive Loading of SDA or SCL Total on-chip and off-chip
10
400
pF
Rpu
(Note 15)
SDA and SCL Bus Pull-Up
Resistor Off-Chip
fSCL
4
0
Maximum is determined by tR and tF.
For Cb = 400pF, max is about 2~2.5k.
For Cb = 40pF, max is about 15~20k
1
k
FN8095.2
March 29, 2006
ISL90843
Operating Specifications Over the recommended operating conditions unless otherwise specified. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
(NOTE 1)
MAX
UNITS
tSU:A
A1 and A0 Setup Time
Before START condition
600
ns
tHD:A
A1 and A0 Hold Time
After STOP condition
600
ns
SDA vs SCL Timing
tF
tHIGH
SCL
tLOW
tR
tSU:DAT
tSU:STA
tHD:DAT
tSU:STO
tHD:STA
SDA
(INPUT TIMING)
tAA
tDH
tBUF
SDA
(OUTPUT TIMING)
A0 and A1 Pin Timing
STOP
START
SCL
CLK 1
SDA IN
tSU:A
tHD:A
A0, A1
NOTES:
1. Typical values are for TA = 25°C and 3.3V supply voltage.
2. LSB: [V(RW)255 – V(RW)0]/255. V(RW)255 and V(RW)0 are V(RW) for the DCP register set to FF hex and 00 hex respectively. LSB is the
incremental voltage when changing from one tap to an adjacent tap.
3. ZS error = V(RW)0/LSB.
4. FS error = [V(RW)255 – VCC]/LSB.
5. DNL = [V(RW)i – V(RW)i-1]/LSB-1, for i = 1 to 255. i is the DCP register setting.
6. INL = [V(RW)i – i • LSB – V(RW)0]/LSB for i = 1 to 255.
7. VMATCH = [V(RWx)i – V(RWy)i]/LSB, for i = 0 to 255, x = 0 to 3 and y = 0 to 3.
Max  V  RW  i  – Min  V  RW  i 
10 6
8. TC V = ----------------------------------------------------------------------------------------------  ----------------- for i = 16 to 240 decimal, T = -40°C to 85°C. Max( ) is the maximum value of the wiper
 Max  V  RW  i  + Min  V  RW  i    2 125°C voltage and Min ( ) is the minimum value of the wiper voltage over the temperature range.
9. MI = |R255 – R0|/255. R255 and R0 are the measured resistances for the DCP register set to FF hex and 00 hex respectively.
10. Roffset = R0/MI, when measuring between RW and RL.
Roffset = R255/MI, when measuring between RW and RH.
11. RDNL = (Ri – Ri-1)/MI-1, for i = 32 to 255.
12. RINL = [Ri – (MI • i) – R0]/MI, for i = 32 to 255.
13. RMATCH = (Ri,x – Ri,y)/MI, for i = 0 to 255, x = 0 to 3 and y = 0 to 3.
6
 Max  Ri  – Min  Ri  
10
14. TC R = ----------------------------------------------------------------  ----------------- for i = 32 to 255, T = -40°C to 85°C. Max( ) is the maximum value of the resistance and Min ( ) is the
 Max  Ri  + Min  Ri    2 125°C minimum value of the resistance over the temperature range.
15. This parameter is not 100% tested.
5
FN8095.2
March 29, 2006
ISL90843
Typical Performance Curves
1.8
160
Vcc = 2.7, T = 85°C
Vcc = 2.7, T = -40°C
1.6
Vcc = 2.7, T = 25°C
1.4
120
STANDBY ICC (µA)
WIPER RESISTANCE ()
140
100
80
60
40
20
Vcc = 5.5, T = -40°C
Vcc = 5.5, T = 85°C
Vcc = 5.5, T = 25°C
50
100
150
200
1.0
-40°C
0.8
85°C
0.6
0.4
0.2
25°C
0.0
2.7
0
0
1.2
250
3.2
3.7
0.3
Vcc = 5.5, T = -40°C
0.15
4.7
5.2
FIGURE 2. STANDBY Icc vs Vcc
FIGURE 1. WIPER RESISTANCE vs TAP POSITION
[ I(RW) = Vcc/RTOTAL] FOR 50k (U)
0.2
4.2
VCC (V)
TAP POSITION (DECIMAL)
Vcc = 2.7, T = -40°C
Vcc = 5.5, T = -40°C
Vcc = 2.7, T = -40°C
Vcc = 2.7, T = 25°C
Vcc = 5.5, T = 85°C
0.2
0.1
INL (LSB)
DNL (LSB)
0.1
0.05
0
-0.05
0
Vcc = 2.7, T = 25°C
Vcc = 2.7, T = 85°C
-0.1
-0.1
Vcc = 5.5, T = 25°C
Vcc = 2.7, T = 85°C
Vcc = 5.5, T = 85°C
-0.15
-0.2
0
-0.2
-0.3
50
100
150
200
Vcc = 5.5, T = 25°C
250
0
50
100
150
200
250
TAP POSITION (DECIMAL)
TAP POSITION (DECIMAL)
FIGURE 4. INL vs TAP POSITION FOR 10k (W)
FIGURE 3. DNL vs TAP POSITION FOR 10k (W)
0
0.4
-0.1
-0.2
Vcc = 5.5V
-0.3
FSerror (LSB)
ZSerror (LSB)
0.35
0.3
2.7V
0.25
-0.4
Vcc = 2.7V
-0.5
-0.6
-0.7
0.2
-0.8
5.5V
-0.9
0.15
-40
-20
0
20
40
60
TEMPERATURE (°C)
FIGURE 5. ZSerror vs TEMPERATURE
6
80
-1
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
FIGURE 6. FSerror vs TEMPERATURE
FN8095.2
March 29, 2006
ISL90843
Typical Performance Curves
(Continued)
20
1.00
10
0.50
0.00
2.7V
TC (ppm/°C)
END TO END RTOTAL CHANGE (%)
1.50
5.5V
-0.50
0
-10
-1.00
-1.50
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
FIGURE 7. END TO END RTOTAL % CHANGE vs
TEMPERATURE
Signal at Wiper (Wiper Unloaded)
-20
32
82
132
182
232
TAP POSITION (DECIMAL)
FIGURE 8. TC FOR VOLTAGE DIVIDER MODE IN ppm
SCL
Signal at Wiper
(Wiper Unloaded Movement
From ffh to 00h)
Wiper Movement Mid Point
From 80h to 7fh
FIGURE 9. MIDSCALE GLITCH, CODE 80h TO 7Fh (WIPER 0)
Principles of Operation
The ISL90843 is an integrated circuit incorporating four
DCPs with their associated registers, and an I2C serial
interface providing direct communication between a host
and the potentiometers.
DCP Description
Each DCP is implemented with a combination of resistor
elements and CMOS switches. The physical ends of each
DCP are equivalent to the fixed terminals of a mechanical
potentiometer (RH and RL pins). The RW pin of each DCP is
connected to intermediate nodes, and is equivalent to the
wiper terminal of a mechanical potentiometer. The position
of the wiper terminal within the DCP is controlled by an 8-bit
volatile Wiper Register (WR). Each DCP has its own WR.
When the WR of a DCP contains all zeroes (WR<7:0>: 00h),
its wiper terminal (RW) is closest to its “Low” terminal (RL).
When the WR of a DCP contains all ones (WR<7:0>: FFh),
its wiper terminal (RW) is closest to its “High” terminal (RH).
7
FIGURE 10. LARGE SIGNAL SETTLING TIME
As the value of the WR increases from all zeroes (00h) to all
ones (255 decimal), the wiper moves monotonically from the
position closest to RL to the closest to RH. At the same time,
the resistance between RW and RL increases monotonically,
while the resistance between RH and RW decreases
monotonically.
While the ISL90843 is being powered up, all four WRs are
reset to 80h (128 decimal), which locates RW roughly at the
center between RL and RH.
The WRs can be read or written directly using the I2C serial
interface as described in the following sections. The I2C
interface Address Byte has to be set to 00hex, 01hex,
02hex, and 03hex to access the WR of DCP0, DCP1, DCP2,
and DCP3 respectively.
I2C Serial Interface
The ISL90843 supports a bidirectional bus oriented protocol.
The protocol defines any device that sends data onto the
FN8095.2
March 29, 2006
ISL90843
bus as a transmitter and the receiving device as the receiver.
The device controlling the transfer is a master and the
device being controlled is the slave. The master always
initiates data transfers and provides the clock for both
transmit and receive operations. Therefore, the ISL90843
operates as a slave device in all applications.
All communication over the I2C interface is conducted by
sending the MSB of each byte of data first.
Protocol Conventions
Data states on the SDA line can change only during SCL
LOW periods. SDA state changes during SCL HIGH are
reserved for indicating START and STOP conditions (See
Figure 11). On power-up of the ISL90843 the SDA pin is in
the input mode.
All I2C interface operations must begin with a START
condition, which is a HIGH to LOW transition of SDA while
SCL is HIGH. The ISL90843 continuously monitors the SDA
and SCL lines for the START condition and does not
respond to any command until this condition is met (See
Figure 11). A START condition is ignored during the powerup of the device.
of a read operation, or at the end of a write operation places
the device in its standby mode.
An ACK, Acknowledge, is a software convention used to
indicate a successful data transfer. The transmitting device,
either master or slave, releases the SDA bus after
transmitting eight bits. During the ninth clock cycle, the
receiver pulls the SDA line LOW to acknowledge the
reception of the eight bits of data (See Figure 12).
The ISL90843 responds with an ACK after recognition of a
START condition followed by a valid Identification Byte, and
once again after successful receipt of an Address Byte. The
ISL90843 also responds with an ACK after receiving a Data
Byte of a write operation. The master must respond with an
ACK after receiving a Data Byte of a read operation
A valid Identification Byte contains 01010 as the five MSBs,
and the following two bits matching the logic values present
at pins A1 and A0. The LSB is in the Read/Write bit. Its value
is “1” for a Read operation, and “0” for a Write operation
(See Table 1).
TABLE 1. IDENTIFICATION BYTE FORMAT
Logic values at pins A1, and A0 respectively
All I2C interface operations must be terminated by a STOP
condition, which is a LOW to HIGH transition of SDA while
SCL is HIGH (See Figure 11). A STOP condition at the end
0
1
0
1
0
A1
(MSB)
A0
R/W
(LSB)
SCL
SDA
START
DATA
STABLE
DATA
CHANGE
DATA
STABLE
STOP
FIGURE 11. VALID DATA CHANGES, START, AND STOP CONDITIONS
SCL FROM
MASTER
1
8
SDA OUTPUT FROM
TRANSMITTER
9
HIGH IMPEDANCE
HIGH IMPEDANCE
SDA OUTPUT FROM
RECEIVER
START
ACK
FIGURE 12. ACKNOWLEDGE RESPONSE FROM RECEIVER
8
FN8095.2
March 29, 2006
ISL90843
WRITE
SIGNALS FROM
THE MASTER
SIGNAL AT SDA
S
T
A
R
T
IDENTIFICATION
BYTE
ADDRESS
BYTE
0 1 0 1 0 A1 A0 0
0 0 0 0 0 0
SIGNALS FROM
THE ISL90843
S
T
O
P
DATA
BYTE
A
C
K
A
C
K
A
C
K
FIGURE 13. BYTE WRITE SEQUENCE
SIGNALS
FROM THE
MASTER
S
T
A
R
T
SIGNAL AT SDA
IDENTIFICATION
BYTE WITH
R/W=0
ADDRESS
BYTE
0 1 0 1 0 A1 A0 0
A
C
K
S
A
T
C
O
K
P
A
C
K
0 1 0 1 0 A1 A0 1
0 0 0 0 0 0
A
C
K
SIGNALS FROM
THE SLAVE
S
T
A IDENTIFICATION
R
BYTE WITH
T
R/W=1
A
C
K
A
C
K
FIRST READ
DATA BYTE
LAST READ
DATA BYTE
FIGURE 14. READ SEQUENCE
Write Operation
Read Operation
A Write operation requires a START condition, followed by a
valid Identification Byte, a valid Address Byte, a Data Byte,
and a STOP condition. After each of the three bytes, the
ISL90843 responds with an ACK. At this time, the device
enters its standby state (See Figure 13).
A Read operation consist of a three byte instruction followed
by one or more Data Bytes (See Figure 14). The master
initiates the operation issuing the following sequence: a
START, the Identification byte with the R/W bit set to “0”, an
Address Byte, a second START, and a second Identification
byte with the R/W bit set to “1”. After each of the three bytes,
the ISL90843 responds with an ACK. Then the ISL90843
transmits Data Bytes as long as the master responds with an
ACK during the SCL cycle following the eighth bit of each
byte. The master terminates the read operation (issuing a
NACK and a STOP condition) following the last bit of the last
Data Byte (See Figure 14).
The Data Bytes are from the registers indicated by an
internal pointer. This pointer initial value is determined by the
Address Byte in the Read operation instruction, and
increments by one during transmission of each Data Byte.
After reaching the memory location 03h the pointer “rolls
over” to 00h, and the device continues to output data for
each ACK received.
9
FN8095.2
March 29, 2006
ISL90843
MSOP Packaging Information
10 Lead MSOP, Package Code
0.0106 [0.27]
0.0067 [0.17]
10
9
8
7
4
6
0.0106 [0.27]
0.1970 [5.00]
0.1890 [4.80]
4
0.0067 [0.17]
WITH
PLATING
(S)
0.0091 [0.23]
0.0050 [0.127]
0.0051 [0.13]
WITH PLATING
1
2
3
4
0.0080 [0.203]
REF
5
BASE
METAL
0.0197 [0.50] BSC
SECTION A-A
0.0374 [0.95]
0.1220 [3.10]
0.1142 [2.90]
2
0.0295 [0.75]
0.0433 [1.10] MAX.
0.1220 [3.10]
0.0098 [0.25]
GAUGE PLANE
0.1142 [2.90]
A
0.1220 [3.10]
0.0059 [0.15]
0.0020 [0.05]
0.1142 [2.90]
(S)
3
3
0°-6°
A
0.0276 [0.70]
0.0157 [0.40]
0.0039 [0.10]
MAX.
(S)
NOTES:
1. Package dimensions conform to JEDEC specification MO-187BA.
2.
2 Does not include mold flash, protrusion
or gate burrs, mold flash protrusions
or gate burrs shall not exceed 0.15 mm per side.
3.
3
Does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.15 mm per side.
4.
4
Does not include dambar protrusion. Allowable dambar protrusion shall be 0.8 mm.
5. Lead span/stand-off height/coplanarity are considered as special characteristics.
6. Controlling dimensions in inches [mm].
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
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
10
FN8095.2
March 29, 2006
ISL90843
T
ODUC
T
TE PR
E
ODUC
L
R
O
P
S
E
T
OB
U
IT
BST
LE SU L90841 Data Sheet
IS
POSSIB
Quad Digital Controlled Potentiometers (XDCP™)
March 29, 2006
Low Noise, Low Power, I2C® Bus,
256 Taps
FN8095.2
Features
• Four potentiometers in one package
The ISL90843 integrates four digitally controlled
potentiometers (XDCP) on a monolithic CMOS integrated
circuit.
• 256 resistor taps–0.4% resolution
• I2C serial interface
- Two address pins allow up to four devices/bus
The digitally controlled potentiometers are implemented with
a combination of resistor elements and CMOS switches. The
position of the wipers are controlled by the user through the
I2C bus interface. Each potentiometer has an associated
Wiper Register (WR) that can be directly written to and read
by the user. The contents of the WR controls the position of
the wiper.
• Wiper resistance: 70 typical @ 3.3V
• Standby current <5µA max
• Power supply: 2.7V to 5.5V
• 10k or 50k total resistance
• 10 Ld MSOP package
The DCPs can be used as a voltage divider in a wide variety
of applications including control, AC measurement, and
signal processing.
• Pb-free plus anneal product (RoHS compliant)
Pinout
ISL90843
(10 LD MSOP)
TOP VIEW
RW3
1
10
RW0
SCL
2
9
VCC
SDA
3
8
A1
GND
4
7
A0
RW2
5
6
RW1
Ordering Information
PART NUMBER
(Note)
PART MARKING
RESISTANCE OPTION
(k)
TEMP RANGE
(°C)
PACKAGE
(Pb-Free)
ISL90843WIU1027Z*
DET
10
-40 to +85
10 Ld MSOP
ISL90843UIU1027Z*
DES
50
-40 to +85
10 Ld MSOP
*Add "-TK" suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL90843
Functional Diagram
VCC
RH
RH
RH
RH
SCL
SDA
I2C
INTERFACE
A0
A1
RL
GND
RW0
RL
RL
RL
RW1
RW2
RW3
Block Diagram
VCC
I2C
INTERFACE
SDA
SCL
WR3
DCP3
RW3
WR2
DCP2
RW2
WR1
DCP1
RW1
WR0
DCP0
RW0
POWER-UP,
INTERFACE,
CONTROL AND
STATUS LOGIC
A1
A0
GND
Pin Descriptions
MSOP PIN
SYMBOL
1
RW3
“Wiper” terminal of DCP3
2
SCL
I2C interface clock
3
SDA
Serial data I/O for the I2C interface
4
GND
Device ground pin
5
RW2
“Wiper” terminal of DCP2
6
RW1
“Wiper” terminal of DCP1
7
A0
Device address for the I2C interface
8
A1
Device address for the I2C interface
9
VCC
Power supply pin
10
RW0
“Wiper” terminal of DCP0
2
DESCRIPTION
FN8095.2
March 29, 2006
ISL90843
Absolute Maximum Ratings
Recommended Operating Conditions
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Voltage at any Digital Interface Pin
with Respect to GND . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC+0.3
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V
Voltage at any DCP Pin with
Respect to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC
Lead Temperature (Soldering, 10s) . . . . . . . . . . . . . . . . . . . . . 300°C
IW (10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6mA
Industrial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Power Rating of each DCP . . . . . . . . . . . . . . . . . . . . . . . . . . . .5mW
Wiper Current of each DCP . . . . . . . . . . . . . . . . . . . . . . . . . . ±3.0mA
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.
Analog Specifications
SYMBOL
Over recommended operating conditions unless otherwise stated.
PARAMETER
RTOTAL
TEST CONDITIONS
RH to RL Resistance
MIN
W, U versions respectively
RH to RL Resistance Tolerance
TYP
(NOTE 1)
Wiper Resistance
CW
Potentiometer Capacitance (Note 15)
UNITS
10, 50
-20
RW
MAX
VCC = 3.3V @ 25°C
k
+20
%
70

25
pF
VOLTAGE DIVIDER MODE (0V @ RLi; VCC @ RHi; measured at RWi, unloaded; i = 0, 1, 2, or 3)
INL (Note 6)
Integral Non-Linearity
DNL (Note 5) Differential Non-Linearity
ZSerror
(Note 3)
Zero-Scale Error
FSerror
(Note 4)
Full-Scale Error
VMATCH
(Note 7)
DCP to DCP Matching
Monotonic over all tap positions
TCV (Note 8) Ratiometric Temperature Coefficient
-1
1
LSB
(Note 2)
-0.5
0.5
LSB
(Note 2)
LSB
(Note 2)
W option
0
1
7
U option
0
0.5
2
W option
-7
-1
0
U option
-2
-1
0
Any two DCPs at same tap position, same
voltage at all RH terminals, and same voltage at
all RL terminals
-2
DCP register set to 80 hex
LSB
(Note 2)
2
LSB
(Note 2)
±4
ppm/°C
Operating Specifications Over the recommended operating conditions unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
(NOTE 1)
MAX
UNITS
= 400kHz; SDA = Open; (for I2C, Active,
ICC1
VCC Supply Current
(Volatile write/read)
10k DCPs, fSCL
Read and Write States)
3.8
mA
ICC2
VCC Supply Current
(Volatile write/read)
50k DCPs, fSCL = 400kHz; SDA = Open; (for I2C, Active,
Read and Write States)
2.9
mA
VCC current (standby)
VCC = +5.5V, 10k DCPs, I2C Interface in Standby State
2.8
mA
VCC = +5.5V, 50k DCPs, I2C Interface in Standby State
0.6
mA
VCC = +3.6V, 10k DCPs, I2C Interface in Standby State
1.9
mA
VCC = +3.6V, 50k DCPs, I2C Interface in Standby State
0.4
mA
10
µA
1
µs
2.6
V
ISB
ILkgDig
tDCP
(Note 15)
Vpor
Leakage Current, at Pins A0, A1, Voltage at pin from GND to VCC
SDA and SCL Pins
DCP Wiper Response Time
SCL falling edge of last bit of DCP Data Byte to wiper
change
Power-On Recall Voltage
Minimum VCC at which memory recall occurs
3
-10
1.8
FN8095.2
March 29, 2006
ISL90843
Operating Specifications Over the recommended operating conditions unless otherwise specified. (Continued)
SYMBOL
VccRamp
PARAMETER
TEST CONDITIONS
VCC Ramp Rate
MIN
TYP
(NOTE 1)
MAX
0.2
tD (Note 15) Power-Up Delay
VCC above Vpor, to DCP Initial Value Register recall
completed, and I2C Interface in Standby State.
UNITS
V/ms
3
ms
SERIAL INTERFACE SPECS
VIL
A1, A0, SDA, and SCL Input
Buffer LOW Voltage
-0.3
0.3*VCC
V
VIH
A1, A0, SDA, and SCL Input
Buffer HIGH Voltage
0.7*VCC
VCC+0.3
V
Hysteresis SDA and SCL Input Buffer
(Note 15) Hysteresis
VOL
(Note 15)
SDA Output Buffer LOW Voltage,
Sinking 4mA
Cpin
(Note 15)
V
0.05*
VCC
0.4
V
A1, A0, SDA, and SCL Pin
Capacitance
10
pF
SCL Frequency
400
kHz
tIN
(Note 15)
Pulse Width Suppression Time at Any pulse narrower than the max spec is suppressed.
SDA and SCL Inputs
50
ns
tAA
(Note 15)
SCL Falling Edge to SDA Output SCL falling edge crossing 30% of VCC, until SDA exits
the 30% to 70% of VCC window.
Data Valid
900
ns
tBUF
(Note 15)
Time the Bus Must be Free Before SDA crossing 70% of VCC during a STOP condition, to
the Start of a New Transmission SDA crossing 70% of VCC during the following START
condition.
1300
ns
tLOW
Clock LOW Time
Measured at the 30% of VCC crossing.
1300
ns
tHIGH
Clock HIGH Time
Measured at the 70% of VCC crossing.
600
ns
tSU:STA
START Condition Setup Time
SCL rising edge to SDA falling edge. Both crossing 70%
of VCC.
600
ns
tHD:STA
START Condition Hold Time
From SDA falling edge crossing 30% of VCC to SCL
falling edge crossing 70% of VCC.
600
ns
tSU:DAT
Input Data Setup Time
From SDA exiting the 30% to 70% of VCC window, to
SCL rising edge crossing 30% of VCC.
100
ns
tHD:DAT
Input Data Hold Time
From SCL rising edge crossing 70% of VCC to SDA
entering the 30% to 70% of VCC window.
0
ns
tSU:STO
STOP Condition Setup Time
From SCL rising edge crossing 70% of VCC, to SDA
rising edge crossing 30% of VCC.
600
ns
tHD:STO
STOP Condition Hold Time for
Read, or Volatile Only Write
From SDA rising edge to SCL falling edge. Both crossing
70% of VCC.
600
ns
tDH
(Note 15)
Output Data Hold Time
From SCL falling edge crossing 30% of VCC, until SDA
enters the 30% to 70% of VCC window.
0
ns
tR
(Note 15)
SDA and SCL Rise Time
From 30% to 70% of VCC
20 +
0.1 * Cb
250
ns
tF
(Note 15)
SDA and SCL Fall Time
From 70% to 30% of VCC
20 +
0.1 * Cb
250
ns
Cb
(Note 15)
Capacitive Loading of SDA or SCL Total on-chip and off-chip
10
400
pF
Rpu
(Note 15)
SDA and SCL Bus Pull-Up
Resistor Off-Chip
fSCL
4
0
Maximum is determined by tR and tF.
For Cb = 400pF, max is about 2~2.5k.
For Cb = 40pF, max is about 15~20k
1
k
FN8095.2
March 29, 2006
ISL90843
Operating Specifications Over the recommended operating conditions unless otherwise specified. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
(NOTE 1)
MAX
UNITS
tSU:A
A1 and A0 Setup Time
Before START condition
600
ns
tHD:A
A1 and A0 Hold Time
After STOP condition
600
ns
SDA vs SCL Timing
tF
tHIGH
SCL
tLOW
tR
tSU:DAT
tSU:STA
tHD:DAT
tSU:STO
tHD:STA
SDA
(INPUT TIMING)
tAA
tDH
tBUF
SDA
(OUTPUT TIMING)
A0 and A1 Pin Timing
STOP
START
SCL
CLK 1
SDA IN
tSU:A
tHD:A
A0, A1
NOTES:
1. Typical values are for TA = 25°C and 3.3V supply voltage.
2. LSB: [V(RW)255 – V(RW)0]/255. V(RW)255 and V(RW)0 are V(RW) for the DCP register set to FF hex and 00 hex respectively. LSB is the
incremental voltage when changing from one tap to an adjacent tap.
3. ZS error = V(RW)0/LSB.
4. FS error = [V(RW)255 – VCC]/LSB.
5. DNL = [V(RW)i – V(RW)i-1]/LSB-1, for i = 1 to 255. i is the DCP register setting.
6. INL = [V(RW)i – i • LSB – V(RW)0]/LSB for i = 1 to 255.
7. VMATCH = [V(RWx)i – V(RWy)i]/LSB, for i = 0 to 255, x = 0 to 3 and y = 0 to 3.
Max  V  RW  i  – Min  V  RW  i 
10 6
8. TC V = ----------------------------------------------------------------------------------------------  ----------------- for i = 16 to 240 decimal, T = -40°C to 85°C. Max( ) is the maximum value of the wiper
 Max  V  RW  i  + Min  V  RW  i    2 125°C voltage and Min ( ) is the minimum value of the wiper voltage over the temperature range.
9. MI = |R255 – R0|/255. R255 and R0 are the measured resistances for the DCP register set to FF hex and 00 hex respectively.
10. Roffset = R0/MI, when measuring between RW and RL.
Roffset = R255/MI, when measuring between RW and RH.
11. RDNL = (Ri – Ri-1)/MI-1, for i = 32 to 255.
12. RINL = [Ri – (MI • i) – R0]/MI, for i = 32 to 255.
13. RMATCH = (Ri,x – Ri,y)/MI, for i = 0 to 255, x = 0 to 3 and y = 0 to 3.
6
 Max  Ri  – Min  Ri  
10
14. TC R = ----------------------------------------------------------------  ----------------- for i = 32 to 255, T = -40°C to 85°C. Max( ) is the maximum value of the resistance and Min ( ) is the
 Max  Ri  + Min  Ri    2 125°C minimum value of the resistance over the temperature range.
15. This parameter is not 100% tested.
5
FN8095.2
March 29, 2006
ISL90843
Typical Performance Curves
1.8
160
Vcc = 2.7, T = 85°C
Vcc = 2.7, T = -40°C
1.6
Vcc = 2.7, T = 25°C
1.4
120
STANDBY ICC (µA)
WIPER RESISTANCE ()
140
100
80
60
40
20
Vcc = 5.5, T = -40°C
Vcc = 5.5, T = 85°C
Vcc = 5.5, T = 25°C
50
100
150
200
1.0
-40°C
0.8
85°C
0.6
0.4
0.2
25°C
0.0
2.7
0
0
1.2
250
3.2
3.7
0.3
Vcc = 5.5, T = -40°C
0.15
4.7
5.2
FIGURE 2. STANDBY Icc vs Vcc
FIGURE 1. WIPER RESISTANCE vs TAP POSITION
[ I(RW) = Vcc/RTOTAL] FOR 50k (U)
0.2
4.2
VCC (V)
TAP POSITION (DECIMAL)
Vcc = 2.7, T = -40°C
Vcc = 5.5, T = -40°C
Vcc = 2.7, T = -40°C
Vcc = 2.7, T = 25°C
Vcc = 5.5, T = 85°C
0.2
0.1
INL (LSB)
DNL (LSB)
0.1
0.05
0
-0.05
0
Vcc = 2.7, T = 25°C
Vcc = 2.7, T = 85°C
-0.1
-0.1
Vcc = 5.5, T = 25°C
Vcc = 2.7, T = 85°C
Vcc = 5.5, T = 85°C
-0.15
-0.2
0
-0.2
-0.3
50
100
150
200
Vcc = 5.5, T = 25°C
250
0
50
100
150
200
250
TAP POSITION (DECIMAL)
TAP POSITION (DECIMAL)
FIGURE 4. INL vs TAP POSITION FOR 10k (W)
FIGURE 3. DNL vs TAP POSITION FOR 10k (W)
0
0.4
-0.1
-0.2
Vcc = 5.5V
-0.3
FSerror (LSB)
ZSerror (LSB)
0.35
0.3
2.7V
0.25
-0.4
Vcc = 2.7V
-0.5
-0.6
-0.7
0.2
-0.8
5.5V
-0.9
0.15
-40
-20
0
20
40
60
TEMPERATURE (°C)
FIGURE 5. ZSerror vs TEMPERATURE
6
80
-1
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
FIGURE 6. FSerror vs TEMPERATURE
FN8095.2
March 29, 2006
ISL90843
Typical Performance Curves
(Continued)
20
1.00
10
0.50
0.00
2.7V
TC (ppm/°C)
END TO END RTOTAL CHANGE (%)
1.50
5.5V
-0.50
0
-10
-1.00
-1.50
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
FIGURE 7. END TO END RTOTAL % CHANGE vs
TEMPERATURE
Signal at Wiper (Wiper Unloaded)
-20
32
82
132
182
232
TAP POSITION (DECIMAL)
FIGURE 8. TC FOR VOLTAGE DIVIDER MODE IN ppm
SCL
Signal at Wiper
(Wiper Unloaded Movement
From ffh to 00h)
Wiper Movement Mid Point
From 80h to 7fh
FIGURE 9. MIDSCALE GLITCH, CODE 80h TO 7Fh (WIPER 0)
Principles of Operation
The ISL90843 is an integrated circuit incorporating four
DCPs with their associated registers, and an I2C serial
interface providing direct communication between a host
and the potentiometers.
DCP Description
Each DCP is implemented with a combination of resistor
elements and CMOS switches. The physical ends of each
DCP are equivalent to the fixed terminals of a mechanical
potentiometer (RH and RL pins). The RW pin of each DCP is
connected to intermediate nodes, and is equivalent to the
wiper terminal of a mechanical potentiometer. The position
of the wiper terminal within the DCP is controlled by an 8-bit
volatile Wiper Register (WR). Each DCP has its own WR.
When the WR of a DCP contains all zeroes (WR<7:0>: 00h),
its wiper terminal (RW) is closest to its “Low” terminal (RL).
When the WR of a DCP contains all ones (WR<7:0>: FFh),
its wiper terminal (RW) is closest to its “High” terminal (RH).
7
FIGURE 10. LARGE SIGNAL SETTLING TIME
As the value of the WR increases from all zeroes (00h) to all
ones (255 decimal), the wiper moves monotonically from the
position closest to RL to the closest to RH. At the same time,
the resistance between RW and RL increases monotonically,
while the resistance between RH and RW decreases
monotonically.
While the ISL90843 is being powered up, all four WRs are
reset to 80h (128 decimal), which locates RW roughly at the
center between RL and RH.
The WRs can be read or written directly using the I2C serial
interface as described in the following sections. The I2C
interface Address Byte has to be set to 00hex, 01hex,
02hex, and 03hex to access the WR of DCP0, DCP1, DCP2,
and DCP3 respectively.
I2C Serial Interface
The ISL90843 supports a bidirectional bus oriented protocol.
The protocol defines any device that sends data onto the
FN8095.2
March 29, 2006
ISL90843
bus as a transmitter and the receiving device as the receiver.
The device controlling the transfer is a master and the
device being controlled is the slave. The master always
initiates data transfers and provides the clock for both
transmit and receive operations. Therefore, the ISL90843
operates as a slave device in all applications.
All communication over the I2C interface is conducted by
sending the MSB of each byte of data first.
Protocol Conventions
Data states on the SDA line can change only during SCL
LOW periods. SDA state changes during SCL HIGH are
reserved for indicating START and STOP conditions (See
Figure 11). On power-up of the ISL90843 the SDA pin is in
the input mode.
All I2C interface operations must begin with a START
condition, which is a HIGH to LOW transition of SDA while
SCL is HIGH. The ISL90843 continuously monitors the SDA
and SCL lines for the START condition and does not
respond to any command until this condition is met (See
Figure 11). A START condition is ignored during the powerup of the device.
of a read operation, or at the end of a write operation places
the device in its standby mode.
An ACK, Acknowledge, is a software convention used to
indicate a successful data transfer. The transmitting device,
either master or slave, releases the SDA bus after
transmitting eight bits. During the ninth clock cycle, the
receiver pulls the SDA line LOW to acknowledge the
reception of the eight bits of data (See Figure 12).
The ISL90843 responds with an ACK after recognition of a
START condition followed by a valid Identification Byte, and
once again after successful receipt of an Address Byte. The
ISL90843 also responds with an ACK after receiving a Data
Byte of a write operation. The master must respond with an
ACK after receiving a Data Byte of a read operation
A valid Identification Byte contains 01010 as the five MSBs,
and the following two bits matching the logic values present
at pins A1 and A0. The LSB is in the Read/Write bit. Its value
is “1” for a Read operation, and “0” for a Write operation
(See Table 1).
TABLE 1. IDENTIFICATION BYTE FORMAT
Logic values at pins A1, and A0 respectively
All I2C interface operations must be terminated by a STOP
condition, which is a LOW to HIGH transition of SDA while
SCL is HIGH (See Figure 11). A STOP condition at the end
0
1
0
1
0
A1
(MSB)
A0
R/W
(LSB)
SCL
SDA
START
DATA
STABLE
DATA
CHANGE
DATA
STABLE
STOP
FIGURE 11. VALID DATA CHANGES, START, AND STOP CONDITIONS
SCL FROM
MASTER
1
8
SDA OUTPUT FROM
TRANSMITTER
9
HIGH IMPEDANCE
HIGH IMPEDANCE
SDA OUTPUT FROM
RECEIVER
START
ACK
FIGURE 12. ACKNOWLEDGE RESPONSE FROM RECEIVER
8
FN8095.2
March 29, 2006
ISL90843
WRITE
SIGNALS FROM
THE MASTER
SIGNAL AT SDA
S
T
A
R
T
IDENTIFICATION
BYTE
ADDRESS
BYTE
0 1 0 1 0 A1 A0 0
0 0 0 0 0 0
SIGNALS FROM
THE ISL90843
S
T
O
P
DATA
BYTE
A
C
K
A
C
K
A
C
K
FIGURE 13. BYTE WRITE SEQUENCE
SIGNALS
FROM THE
MASTER
S
T
A
R
T
SIGNAL AT SDA
IDENTIFICATION
BYTE WITH
R/W=0
ADDRESS
BYTE
0 1 0 1 0 A1 A0 0
A
C
K
S
A
T
C
O
K
P
A
C
K
0 1 0 1 0 A1 A0 1
0 0 0 0 0 0
A
C
K
SIGNALS FROM
THE SLAVE
S
T
A IDENTIFICATION
R
BYTE WITH
T
R/W=1
A
C
K
A
C
K
FIRST READ
DATA BYTE
LAST READ
DATA BYTE
FIGURE 14. READ SEQUENCE
Write Operation
Read Operation
A Write operation requires a START condition, followed by a
valid Identification Byte, a valid Address Byte, a Data Byte,
and a STOP condition. After each of the three bytes, the
ISL90843 responds with an ACK. At this time, the device
enters its standby state (See Figure 13).
A Read operation consist of a three byte instruction followed
by one or more Data Bytes (See Figure 14). The master
initiates the operation issuing the following sequence: a
START, the Identification byte with the R/W bit set to “0”, an
Address Byte, a second START, and a second Identification
byte with the R/W bit set to “1”. After each of the three bytes,
the ISL90843 responds with an ACK. Then the ISL90843
transmits Data Bytes as long as the master responds with an
ACK during the SCL cycle following the eighth bit of each
byte. The master terminates the read operation (issuing a
NACK and a STOP condition) following the last bit of the last
Data Byte (See Figure 14).
The Data Bytes are from the registers indicated by an
internal pointer. This pointer initial value is determined by the
Address Byte in the Read operation instruction, and
increments by one during transmission of each Data Byte.
After reaching the memory location 03h the pointer “rolls
over” to 00h, and the device continues to output data for
each ACK received.
9
FN8095.2
March 29, 2006
ISL90843
MSOP Packaging Information
10 Lead MSOP, Package Code
0.0106 [0.27]
0.0067 [0.17]
10
9
8
7
4
6
0.0106 [0.27]
0.1970 [5.00]
0.1890 [4.80]
4
0.0067 [0.17]
WITH
PLATING
(S)
0.0091 [0.23]
0.0050 [0.127]
0.0051 [0.13]
WITH PLATING
1
2
3
4
0.0080 [0.203]
REF
5
BASE
METAL
0.0197 [0.50] BSC
SECTION A-A
0.0374 [0.95]
0.1220 [3.10]
0.1142 [2.90]
2
0.0295 [0.75]
0.0433 [1.10] MAX.
0.1220 [3.10]
0.0098 [0.25]
GAUGE PLANE
0.1142 [2.90]
A
0.1220 [3.10]
0.0059 [0.15]
0.0020 [0.05]
0.1142 [2.90]
(S)
3
3
0°-6°
A
0.0276 [0.70]
0.0157 [0.40]
0.0039 [0.10]
MAX.
(S)
NOTES:
1. Package dimensions conform to JEDEC specification MO-187BA.
2.
2 Does not include mold flash, protrusion
or gate burrs, mold flash protrusions
or gate burrs shall not exceed 0.15 mm per side.
3.
3
Does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.15 mm per side.
4.
4
Does not include dambar protrusion. Allowable dambar protrusion shall be 0.8 mm.
5. Lead span/stand-off height/coplanarity are considered as special characteristics.
6. Controlling dimensions in inches [mm].
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
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
10
FN8095.2
March 29, 2006
Similar pages