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PDF MAX1299 Data sheet ( Hoja de datos )
| Número de pieza | MAX1299 | |
| Descripción | 12-Bit Serial-Output Temperature Sensors | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1726; Rev 1; 3/12
12-Bit Serial-Output Temperature Sensors
with 5-Channel ADC
General Description
The MAX1298/MAX1299 implement local and remote
temperature sensing with 12-bit resolution, using +5V
and +3V supply voltages, respectively. Accuracy is
±1°C from 0 to +70°C, with no calibration needed. The
devices feature an algorithmic switched-capacitor ana-
log-to-digital converter (ADC), an on-chip clock, and a
3-wire serial interface compatible with SPI, QSPI™, and
MICROWIRE®.
The MAX1298/MAX1299 also perform fully differential
voltage measurements with 12-bit resolution and sepa-
rate track-and-hold (T/H) for positive and negative
inputs. Both devices accept versatile input modes con-
sisting of two 3-channel signal pairs, five 1-channel sig-
nals relative to an AIN5, or VDD/4 relative to ground. An
external reference may be used for more accurate volt-
age measurements.
Typical power consumption is only 1.3mW (MAX1299).
A shutdown mode and two standby modes provide
multiple strategies for prolonging battery life in portable
applications that require limited sampling throughput.
The MAX1298/MAX1299 are available in 16-pin SSOP
packages.
________________________Applications
Temperature/Voltage Supervision of
Workstations and Communications Equipment
Hand-Held Instruments
Medical Equipment
Industrial Process Control
Features
o Local and Remote Temperature Sensing
o 12-Bit Resolution for Temperature and Voltage
Inputs
o ±1°C Accuracy from -40°C to +85°C
o Fully Differential Inputs
o Single-Supply Operation
+4.75V to +5.25V (MAX1298)
+2.7V to +3.6V (MAX1299)
o 3-Wire SPI/QSPI/MICROWIRE-Compatible
Interface
o Internal Precision Voltage Reference
2.50V (MAX1298)
1.20V (MAX1299)
o Space-Saving 16-Pin SSOP Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX1298CEAE+
-40°C to +85°C
16 SSOP
MAX1299CEAE+
-40°C to +85°C
16 SSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
Typical Operating Circuit appears at end of data sheet.
TOP VIEW
+
AIN1 1
SHO 2
AIN2 3
AIN3 4
AIN4 5
MAX1298
MAX1299
GND 6
SSTRB 7
CS 8
SSOP
16 AIN0
15 AIN5
14 REF
13 GND
12 VDD
11 SCLK
10 DIN
9 DOUT
QSPI is a trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
12-Bit Serial-Output Temperature Sensors
with 5-Channel ADC
TIMING CHARACTERISTICS
(VDD = +4.75V to 5.25V (MAX1298), VDD = +2.7V to +3.6V (MAX1299), external reference, VREF = +2.5V (MAX1298), VREF = +1.2V
(MAX1299), fSCLK = 2.5MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Figures 4, 6)
PARAMETER
SCLK Frequency
SCLK Pulse Width Low
SCLK Pulse Width High
CS Low to SCLK High
SCLK High to CS Setup
CS Pulse Width
SCLK High to CS Low Setup
SCLK High to CS High Setup
DIN Setup to SCLK High Time
DIN Hold Time
SCLK Fall to Output Data Valid
CS Fall to Output Enable
CS Rise to Output Disable
SSTRB Rise to SCLK Rise
SYMBOL
fSCLK
tCL
tCH
tCSS
tCSH
tCS
tCS0
tCS1
tDS
tDH
tDO
tDV
tTR
tSCLK
CONDITIONS
RL = 100kΩ, CL = 50pF
RL = 100kΩ, CL = 50pF
RL = 100kΩ, CL = 50pF
MIN TYP MAX UNITS
2.5 MHz
200 ns
200 ns
100 ns
100 ns
100 ns
50 ns
100 ns
100 ns
0 ns
150 ns
150 ns
50 ns
0 ns
SCLK Fall to SSTRB Fall
tSSTRB
200 ns
Note 1: Tested at VDD = +5.0V (MAX1298) and VDD = +3.0V (MAX1299).
Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has
been calibrated.
Note 3: Conversion time is defined as the number of clock cycles (64 for voltage measurements, 125 for temperature measure-
ments) multiplied by the internal clock period.
Note 4: Individual analog input voltages cannot extend beyond the power-supply rails.
Note 5: Input resistance is typically 250MΩ; 5µA limit reflects limitations in production testing.
Note 6: Specifications for full-on status assume continuous conversions. Power modes are software selected (Table 4).
Note 7: Measured at VFS(+4.75V) - VFS(+5.25V) for the MAX1298 and at VFS(+2.7V) - VFS(+3.6V) for the MAX1299.
Note 8: External load should not change during conversions for specified accuracy.
Note 9: Excludes noise and self-heating effects. Output error for MAX129_C guaranteed by design.
Note 10: External temperature sensing over -40°C to +85°C range, device at +25°C. Guaranteed by design.
_______________________________________________________________________________________ 5
5 Page 
12-Bit Serial-Output Temperature Sensors
with 5-Channel ADC
CS
SCLK
DIN
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
DIODE
BIAS
CONTROL
INPUT
REGISTER
MAX1298
MAX1299
CONTROL
LOGIC
OUTPUT
REGISTER
CLOCK
INPUT
MUX
T/H IN+
12-BIT
ADC
T/H IN-
VDD/4
SHIELD
OUTPUT
REF
DOUT
VDD
GND
SHO REF
Figure 1. Functional Diagram
Detailed Description
The MAX1298/MAX1299 are low-power, serial-output,
multichannel ADCs with temperature-sensing capability
for thermostatic, process-control, and monitoring appli-
cations. An algorithmic switched-capacitor converter
with T/H circuitry for both positive and negative inputs
supports fully differential 12-bit conversions from an
internal temperature sensor, two external temperature
sensors, or voltage sources in a variety of channel con-
figurations. Microprocessor (µP) control is made easy
through a flexible 3-wire serial interface.
Figure 1 shows a simplified functional diagram of the
internal architecture for the MAX1298/MAX1299. In tem-
perature-sensing mode, the multiplexer (mux) steers
bias currents through internal or external diodes while
the ADC computes their temperature in relation to
changes in forward voltage. Channels not used for tem-
perature measurement can be configured to measure
other system voltages.
______________________________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MAX1299.PDF ] | |
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