參數(shù)資料
型號: ADT7462ACPZ-500RL7
廠商: ON SEMICONDUCTOR
元件分類: 溫度/濕度傳感器
英文描述: DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT
封裝: 5 X 5 MM, LFCSP-32
文件頁數(shù): 55/88頁
文件大小: 836K
代理商: ADT7462ACPZ-500RL7
ADT7462
Rev. 2 | Page 59 of 88 | www.onsemi.com
POWER-UP SEQUENCE
The power-up sequence of the ADT7462 is as follows:
1.
The temperature of the thermal diode connected to Pin 17
and Pin 18 (only dedicated thermal diode channel) is
monitored immediately on power-up of the ADT7462.
Ideally, the hottest zone should be connected to this channel
so protection is provided immediately on power-up.
2.
VCCP1 is also monitored immediately on power-up. VCCP1 is
typically connected to a main power rail. Switching on the
VCCP1 rail gates the fan’s quiet start-up counter.
3.
VBATT is monitored immediately on power-up before the
setup complete bit (Register 0x01, Bit 5) is set. The chassis
intrusion circuit (CI) is powered from VBATT. If the measured
VBATT reading is lower than the lower limit (default =
0x80), the CI circuit is turned off.
4.
PWM1, PWM2, and PWM4 are not on dedicated pins.
Because these pins are shared with inputs, they are allowed
to float high on power-up. This means that if a fan is
connected to these pins, it spins at full speed on power-up.
5.
PWM2 is switched off by default (because this is a
dedicated pin). If no SMBus communication takes place
within 4.6 seconds of the VCCP rail switching on, this PWM
drive is driven to full speed. If SMBus communication
does take place, this pin behaves as programmed.
6.
No temperature or voltage (other than VCCP1, Diode 2, and
VBATT) is monitored until the setup complete bit (Bit 5) is set
in Configuration Register 1 (0x01). This allows the user to
program the ADT7462 as required before monitoring of all
channels is enabled, thereby not generating false ALERTs.
The setup complete bit should not be set until the device is
fully configured for the desired monitoring functions.
The following steps describe how to set up the ADT7462:
1.
Power up the device.
2.
Choose the best-suited easy configuration option for the
application, changing pin functions as required.
3.
Program all appropriate limits for monitored inputs.
Program device parameters, fan control parameters, mask
bits, and anything else required for the application.
4.
Set the setup complete bit. Do not set this bit until the
device is fully set up.
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