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参数资料
| 型号： | MAX6698EE38+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 14/24页 |
| 文件大小： | 321K |
| 描述： | IC TEMP MONITOR I2C 7CH 16QSOP |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C |
| 精确度： | ±3.5°C 本地（最大），±3°C 远程（最大） |
| 拓扑： | ADC，缓冲器，多路复用器，寄存器库 |
| 输出类型： | 2 线串行，I²C?/SMBUS? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
channel 1. The series resistance cancellation function
increases the conversion time for channel 1 by 125ms.
This feature cancels the bulk resistance of the sensor
and any other resistance in series (wire, contact resis-
tance, etc.). The cancellation range is from 0 to 100&.
Discrete Remote Diodes
When the remote-sensing diode is a discrete transistor,
its collector and base must be connected together. Table
11 lists examples of discrete transistors that are appropri-
ate for use with the MAX6698. The transistor must be a
small-signal type with a relatively high forward voltage;
otherwise, the A/D input voltage range can be violated.
The forward voltage at the highest expected temperature
must be greater than 0.25V at 10礎, and at the lowest
expected temperature, the forward voltage must be less
than 0.95V at 100礎. Large power transistors must not be
used. Also, ensure that the base resistance is less than
10&. Tight specifications for forward current gain (50 < ?/DIV>
<150, for example) indicate that the manufacturer has
good process controls and that the devices have consis-
tent V
BE
characteristics. Manufacturers of discrete tran-
sistors do not normally specify or guarantee ideality
factor. This is normally not a problem since good-quality
discrete transistors tend to have ideality factors that fall
within a relatively narrow range. We have observed varia-
tions in remote temperature readings of less than ?癈
with a variety of discrete transistors. Still, it is good design
practice to verify good consistency of temperature read-
ings with several discrete transistors from any manufac-
turer under consideration.
Unused Diode Channels
If one or more of the remote diode channels is not need-
ed, the DXP and DXN inputs for that channel should
either be unconnected, or the DXP input should be con-
nected to V
CC
. The status register indicates a diode
"fault" for this channel and the channel is ignored during
the temperature-measurement sequence. It is also good
practice to mask any unused channels immediately upon
power-up by setting the appropriate bits in the
Configuration 2 and Configuration 3 registers. This will
prevent unused channels from causing ALERT# or
OVERT# to assert.
Thermistor Measurements
The MAX6698 can use three external thermistors to
measure temperature. A thermistors resistance varies
as a function of temperature. A negative temperature
coefficient (NTC) thermistor can be connected between
the thermistor input and ground, with a series resistor,
REXT_, connected from the thermistor input to VREF.
7-Channel Precision Remote-Diode, Thermistor,
and Local Temperature Monitor
14 ______________________________________________________________________________________
BIT
NAME
P R TATE
FUNCTION
7 M B
Reserved
0
6
Local ALERT
0
Local Channel High-Alert Bit. This bit is set to logic 1 when the local temperature
exceeds the temperature threshold limit in the local ALERT high-limit register.
5
Thermistor 3 ALERT
0
Thermistor 3 Alert Bit. This bit is set to logic 1 when the thermistor 3 voltage
exceeds the threshold limit in the thermistor 3 ALERT high-limit register.
4
Thermistor 2 ALERT
0
Thermistor 2 Alert Bit. This bit is set to logic 1 when the thermistor 2 voltage
exceeds the threshold limit in the thermistor 2 ALERT high-limit register.
3
Thermistor 1 ALERT
0
Thermistor 1 Alert Bit. This bit is set to logic 1 when the thermistor 1 voltage
exceeds the threshold limit in the thermistor 1 ALERT high-limit register.
2
Remote-Diode 3
ALERT
0
Channel 3 Remote-Diode High-Alert Bit. This bit is set to logic 1 when the
channel 3 remote-diode temperature exceeds the programmed temperature
threshold limit in the remote 3 ALERT high-limit register.
1
Remote-Diode 2
ALERT
0
Channel 2 Remote-Diode High-Alert Bit. This bit is set to logic 1 when the
channel 2 remote-diode temperature exceeds the temperature threshold limit in
the remote 2 ALERT high-limit register.
0
Remote-Diode 1
ALERT
0
Channel 1 Remote-Diode High-Alert Bit. This bit is set to logic 1 when the
channel 1 remote-diode temperature exceeds the temperature threshold limit in
the remote 1 ALERT high-limit register.
Table 8. Status 1 Register
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