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參數(shù)資料
| 型號： | MAX1756BAUT-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SOT23 Local Temperature Comparators with SMBus Serial Interface |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 294K |
| 代理商： | MAX1756BAUT-T |
M
SOT23 Local Temperature Comparators
with SMBus Serial Interface
_______________________________________________________________________________________
5
Detailed Description
The MAX1755/MAX1756 are temperature comparators
designed to work in conjunction with an external μC or
other digital intelligence through an SMBus interface.
The μC is typically a power-management or keyboard
controller, which generates SMBus serial commands
from a GPIO port or through a dedicated SMBus inter-
face block.
Figure 1 illustrates the circuit blocks in the MAX1755/
MAX1756. The output of an analog temperature-to-volt-
age converter signal is compared to the temperature-
stable output of a serially programmed dual-output
digital-to-analog converter (DAC). Great care is taken in
the design to ensure that the thermal signal is propor-
tional to absolute temperature or PTAT. A precision
comparator with low-input offset voltage is used to
compare the PTAT voltage to the DAC output.
The DAC provides two levels: one is set to the rising trip
threshold and the other is set to the falling threshold
(hysteresis) level by a digital subtractor. This arrange-
ment makes the hysteresis value very accurate with
respect to the rising trip point. Each DAC level is alter-
nately compared to the PTAT voltage through a sam-
pling system that reuses the same comparator, thereby
reducing errors due to comparator offset. The sampling
rate is typically 1kHz.
A simplified SMBus interface enables the system to
program the temperature thresholds and read the part
’
s
status register.
SMBus Digital Interface
The SMBus block utilizes the read-byte/write-byte pro-
tocol. It only supports 8-bit reads and writes, has no
command byte, and does not need to support the Alert
Response feature. From a software perspective, the
MAX1755/MAX1756 appear as write registers contain-
ing the DAC comparison value and as read registers
containing the status byte. A standard SMBus 2-wire
serial interface is used to program DAC values and
read the status byte. Figure 2 shows the SMBus data
protocols and Figure 3 details the SMBus timing.
Programming the T
MAX
Register
The T
MAX
register is programmed using a standard
SMBus Send Byte operation. The temperature data for-
mat is 6 bits plus sign in two
’
s complement form, with
each data bit representing 2
°
C (Table 1). The MSB is
transmitted first, LSB last. The MSB (B7) of the T
MAX
register is an embedded control bit, which can either
invert the polarity of the
OVERT
output (MAX1755) or
mask low-going (T
HYST
) interrupts (MAX1756). The B6
bit of the T
MAX
register is the sign bit for the remaining
6 bits that make up the binary-coded temperature
threshold.
Software Standby Mode
If the DAC code is set to negative full scale, the device
goes into software standby mode. In standby mode,
supply current is reduced to 0.8μA. At very low supply
voltages (UVLO threshold), the supply current is higher
due to address decoding. Typical supply current can
be as high as 250μA, depending on the ADD setting,
while the typical ADD input current can be as high as
40μA. Exiting standby mode causes the slave address
to be checked again.
PIN
NAME
FUNCTION
1
ADD
SMBus Address-Select Pin. See Table 3.
2
SMBDATA
SMBus Serial-Data Input/Output, Open Drain
3
SMBCLK
SMBus Serial-Clock Input
OVERT
Open-Drain Thermostat Output
(MAX1755 Only)
4
ALERT
Open-Drain SMBus Alert (Interrupt) Output
(MAX1756 Only)
5
V
CC
Supply Voltage Input, +2.375V to +5.5V. Bypass V
CC
to GND with a 0.1μF capacitor. If supply is
noisy, insert 100
resistor in series with this connection.
6
GND
Ground
Pin Description
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|---|---|
| MAX1755 | SOT23 Local Temperature Comparators with SMBus Serial Interface |
| MAX1755-MAX1756 | SOT23 Local Temperature Comparators with SMBus Serial Interface |
| MAX1756AAUT-T | SOT23 Local Temperature Comparators with SMBus Serial Interface |
| MAX1773 | Power Source Selector for Dual-Battery Systems |
| MAX1773A | Power Source Selector for Dual-Battery Systems |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1756BEUT | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX1756EVKIT | 制造商:Maxim Integrated Products 功能描述:SOT23 LOCAL TEMPERATURE COMPARATOR WITH SMBUS - Bulk |
| MAX1757EAI | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1757EAI+ | 功能描述:電池管理 Li+ Battery Charger w/Int 14V Switch RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1757EAI+T | 功能描述:電池管理 Li+ Battery Charger w/Int 14V Switch RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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