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參數資料
| 型號： | MAX1299CEAE+ |
| 廠商： | Maxim Integrated |
| 文件頁數： | 16/20頁 |
| 文件大?。?/td> | 299K |
| 描述： | IC TEMP SENS W/ADC 16-SSOP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 76 |
| 功能： | 溫度監(jiān)控系統（傳感器） |
| 傳感器類型： | 內部和外部 |
| 感應溫度： | -40°C ~ 85°C，外部傳感器 |
| 精確度： | ±4°C（最小值） |
| 拓撲： | ADC，多路復用器，寄存器庫 |
| 輸出類型： | MICROWIRE?，QSPI?，SPI? |
| 輸出警報： | 無 |
| 輸出風扇： | 無 |
| 電源電壓： | 2.7 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.209"，5.30mm 寬） |
| 供應商設備封裝： | 16-SSOP |
| 包裝： | 管件 |
12-Bit Serial-Output Temperature Sensors
with 5-Channel ADC
16 ______________________________________________________________________________________
Place the MAX1298/MAX1299 in a low-current power-
down state between conversions to conserve power.
Select standby, standby-plus, or shutdown through bits
PM1 and PM0 of the initialization byte (Table 4).
The MAX1298/MAX1299 assume the shutdown power
mode when V
DD
is first applied.
Standby Mode
Standby mode turns off the MAX1298/MAX1299 ADC,
internal clock, and reference buffer amplifier. Special
circuitry for temperature conversions is also deactivat-
ed. Wake-up time is limited by the reference buffer
amplifier and the associated bypass capacitor (see
Internal Reference). When an external reference is
used, wake-up time is 0.1ms.
Standby-Plus Mode
Standby-plus mode is similar to the standby mode, but
the internal reference output buffer remains active to
shorten the wake-up time to 0.1ms for internal refer-
ence mode. When using an external reference, stand-
by-plus mode is equivalent to standby mode.
Shutdown Mode
Shutdown mode turns off all functions other than start-
up circuitry, thereby reducing typical supply current to
2礎. Data registers are cleared. Use this power mode
when interconversion times are no less than 5ms.
Monitoring V
DD
This mode of operation samples and converts the sup-
ply voltage, V
DD
/4, which is internally generated. The
reference voltage must be larger than V
DD
/8 for the
operation to work properly. From the result of a conver-
sion (CODE), CODE = 256 V
DD
/ V
REF
.
Temperature Measurements
The MAX1298/MAX1299 perform temperature measure-
ments with internal or external diode-connected transis-
tors through a three-step process. First, the diode bias
current changes from 31.6礎 to 10礎 to produce a
temperature-dependent bias voltage difference, which
is amplified by a factor of 20 and converted to digital
format. Second, the bias current changes from 31.6礎
to 100礎, and the bias voltage difference is similarly
amplified by a factor of 20 and converted to digital for-
mat. Third, the intermediate results are subtracted to
achieve a digital output that is proportional to absolute
temperature in degrees Kelvin.
The reference voltage used in conjunction with tempera-
ture measurements is derived from the internal reference
source to ensure that 1LSB corresponds to 1/8 of a
degree. To convert to degrees Celsius, subtract 273.15
from the temperature inferred from the ADC output.
Temperature measurements require a conversion time
of 2.2ms.
Shield Output Buffer
The MAX1298/MAX1299 provide a shield output buffer
voltage at SHO that is approximately 0.6V (one diode
drop) above V
DD
/2. When performing temperature
measurements with an external diode, use this voltage
to suppress error-producing leakage currents (see
Remote Diode Shielding). Figure 7 shows the SHO out-
put circuit.
Applications Information
Remote Diode Selection
Temperature accuracy depends on having a good-
quality, diode-connected small-signal transistor.
Accuracy has been experimentally verified for 2N3904
devices. CPUs and other ICs having on-board temper-
ature-sensing diodes can also be monitored if the
diode connections are uncommitted.
The transistor must be a small-signal type with a base
resistance less than 100&. Tight specifications for for-
ward current gain (+50 to +150, for example) indicate
that the manufacturer has good process controls and
that the devices have consistent V
be
characteristics.
(See Table 6 for recommended devices.)
For heatsink mounting, the 500-32BT02-000 thermal
sensor from Fenwal Electronics is a good choice. This
device consists of a diode-connected transistor, an alu-
minum plate with screw hole, and twisted-pair cable
(Fenwal Inc., Milford MA, 508-478-6000).
Table 4. Power-Mode Selection
PM1
PM0
MODE
0
0
Shutdown
0
1
Standby-plus
1
0
Standby
1
1
Normal operation
5
礎
SHO
V
DD
2
Figure 7. SHO Output Circuit
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| MAX1299CEAE+ | 功能描述:板上安裝溫度傳感器 12-Bit Serial-Output w/5Ch ADC RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| MAX1299CEAE+T | 功能描述:板上安裝溫度傳感器 12-Bit Serial-Output w/5Ch ADC RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
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