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PDF MAX5395 Data sheet ( Hoja de datos )
| Número de pieza | MAX5395 | |
| Descripción | Low-Voltage Linear Taper Digital Potentiometer | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX5395
Single, 256-Tap Volatile, I2C, Low-Voltage Linear
Taper Digital Potentiometer
General Description
The MAX5395 single, 256-tap volatile, low-voltage
linear taper digital potentiometer offers three end-to-
end resistance values of 10kΩ, 50kΩ, and 100kΩ.
Potentiometer terminals are independent of supply for
voltages up to 5.25V with single-supply operation from
1.7V to 5.5V (charge pump enabled). User-controlled
shutdown modes allow the H, W, or L terminal to be
opened with the wiper position set to zero-code, mid-
code, full-code, or the value contained in the wiper
register. Ultra-low-quiescent supply current (< 1µA) can
be achieved for supply voltages between 2.6V and 5.5V
by disabling the internal charge pump and not allowing
potentiometer terminals to exceed the supply voltage by
more than 0.3V. The MAX5395 provides a low 50ppm/°C
end-to-end temperature coefficient and features an I2C
serial interface.
The small package size, low operating supply voltage,
low supply current, and automotive temperature range
of the MAX5395 make the device uniquely suited for the
portable consumer market, battery-backup industrial
applications, and automotive market.
The MAX5395 is available in a lead-free, 8-pin TDFN
(2mm x 2mm) package. The device operates over the
-40°C to +125°C automotive temperature range.
Ordering Information appears at end of data sheet.
Features
S Single Linear Taper 256-Tap Positions
S 10kI, 50kI, and 100kI End-to-End Resistance
S 1.7V to 5.5V Extended Single Supply
S 0 to 5.25V H, W, L Operating Voltage Independent
of VDD
S 1µA (typ) Supply Current in Low-Power Mode
S ±1.0 LSB INL, ±0.5 LSB DNL (max) Wiper Accuracy
S Power-On Sets Wiper to Midscale
S 50ppm/NC End-to-End Temperature Coefficient
S 5ppm/NC Ratiometric Temperature Coefficient
S -40NC to +125NC Operating Temperature Range
S 2mm x 2mm, 8-Pin TDFN Package
S I2C-Compatible Serial Interface
Applications
Portable Electronics
System Calibration
Battery-Powered Systems
Automotive Electronics
Mechanical Potentiometer Replacement
Typical Operating Circuit
ADDR0
SDA
SCL
VDD 1.7V TO 5.5V
(CHARGE PUMP ENABLED) H
MAX5395
I2C
INTERFACE
W
+5V
VS
MAX4250
VO
GND L
R1
VO/ VS = 1 + RMAX5395/R1
For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX5395.related
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6393; Rev 1; 9/12
http://www.Datasheet4U.com
1 page  
MAX5395
Single, 256-Tap Volatile, I2C, Low-Voltage Linear
Taper Digital Potentiometer
Typical Operating Characteristics
(TVADD==+215.8°VC,, TuAnl=es+s2o5tNhCe,rwuinsleesnsootethde.)rwise noted.)
SUPPLY CURRENT
SUPPLY CURRENT vs. TEMPERATURE
vs. DIGITAL INPUT VOLTAGE
40
VDD = 1.8V
35
30
25
20
15
10
5
2600
2400
2200 VDD = 3.3V
2000 (LOW-HIGH)
1800
1600
1400
1200
1000 VDD = 1.8V
800 (HIGH-LOW)
600
400
200
VDD = 5V
(LOW-HIGH)
VDD = 5V
(HIGH-LOW)
VDD = 3.3V
(HIGH-LOW)
VDD = 1.8V
(LOW-HIGH)
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
0
01234
TEMPERATURE (°C)
DIGITAL INPUT VOLTAGE (V)
5
SUPPLY CURRENT vs. INPUT VOLTAGE
40
35 TA = +125°C
30
TA = +25°C
25
20
15
10 TA = -40°C
5
0
1.70
2.65 3.60 4.55
INPUT VOLTAGE (V)
5.50
RESISTANCE (W-TO-L)
vs. TAP POSITION (10kI)
10
9
8
7
6
5
4
3
2
1
0
0 32 64 96 128 160 192 224 256
TAP POSITION
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
0
WIPER RESISTANCE
vs. WIPER VOLTAGE
VDD = 2.6V, QP OFF
VDD = 5V, QP OFF
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
WIPER VOLTAGE (V)
RESISTANCE (W-TO-L)
vs. TAP POSITION (50kI)
50
45
40
35
30
25
20
15
10
5
0
0 32 64 96 128 160 192 224 256
TAP POSITION
WIPER RESISTANCE
vs. WIPER VOLTAGE
40
35 VDD = 1.8V, QP ON
30
25
20
15
10
5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
WIPER VOLTAGE (V)
100
90
80
70
60
50
40
30
20
10
0
0
RESISTANCE (W-TO-L)
vs. TAP POSITION (100kI)
32 64 96 128 160 192 224 256
TAP POSITION
END-TO-END RESISTANCE PERCENTAGE
CHANGE vs. TEMPERATURE
0.8
0.6
0.4 100kI
0.2
50kI
0
10kI
-0.2
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Maxim Integrated
5
http://www.Datasheet4U.com
5 Page 
MAX5395
Single, 256-Tap Volatile, I2C, Low-Voltage Linear
Taper Digital Potentiometer
I2C START and STOP Conditions
SDA and SCL idle high when the bus is not in use. A mas-
ter initiates communication by issuing a START condition.
A START condition is a high-to-low transition on SDA with
SCL high. A STOP condition is a low-to-high transition
on SDA while SCL is high (Figure 2). A START condition
from the master signals the beginning of a transmission
to the MAX5395. The master terminates transmission
and frees the bus, by issuing a STOP condition. The bus
remains active if a Repeated START condition is gener-
ated instead of a STOP condition.
I2C Early STOP and Repeated START Conditions
The MAX5395 recognizes a STOP condition at any point
during data transmission except if the STOP condition
occurs in the same high pulse as a START condition.
For proper operation, do not send a STOP condition dur-
ing the same SCL high pulse as the START condition.
Transmissions ending in an early STOP condition will not
impact the internal device settings. If the STOP occurs
during a readback byte, the transmission is terminated
and a later read mode request will begin transfer of the
requested register data from the beginning. See Figure 3.
It is possible to interrupt a transmission to a MAX5395
with a new START (Repeated START) condition (perhaps
addressing another device), which leaves the input regis-
ters with data that has not been transferred to the internal
registers. The unused data will not be stored under these
conditions. The aborted MAX5395 I2C sequence will
have no effect on the part.
I2C Acknowledge
In write mode, the acknowledge bit (ACK) is a clocked
9th bit that the MAX5395 uses to handshake receipt of
each byte of data as shown in Figure 4. The MAX5395
pulls down SDA during the entire master-generated 9th
clock pulse if the previous byte is successfully received.
Monitoring ACK allows for detection of unsuccessful
data transfers. An unsuccessful data transfer occurs if a
receiving device is busy or if a system fault has occurred.
In the event of an unsuccessful data transfer, the bus
master will retry communication.
SDA
SCL
tHD:STA
tSU:DAT
tLOW tHD-DAT
tHIGH
tR
tF
START
CONDITION
(S)
Figure 2. I2C Timing Diagram
tSU:DTA
tHD:STA
tSU:STD
tBUF
REPEATED
START CONDITION
(Sr)
ACKNOWLEDGE (A)
STOP CONDITION START CONDITION
(P) (S)
S
SCL
Sr P
PS
SP
PSP
SDA
VALID START, REPEATED START, AND STOP PULSES
INVALID START/STOP PULSE PAIRINGS-ALL WILL BE RECOGNIZED AS STARTS
Figure 3. I2C START(s), Repeated START(S), and STOP(S) Conditions
Maxim Integrated
11
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11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MAX5395.PDF ] | |
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