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參數(shù)資料
| 型號(hào)： | NCT7491RQR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 36/80頁 |
| 文件大小： | 844K |
| 描述： | IC REMOTE THERMAL MONITOR 24QSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | * |
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NCT7491
http://onsemi.com
36
Voltage Measurement Selection
The user can select which voltage channels to include in
the monitoring loop. By only including the channels that are
required the loop monitoring time can be reduced.
" Setting <2> of register 0x11 includes the V
TT
channel
in the monitoring loop.
" Setting <3> of register 0x13 includes the 12V channel
in the monitoring loop.
" Setting <4> of register 0x13 includes the 5 V channel in
the monitoring loop.
" Setting <5> of register 0x13 includes the Vccp channel
in the monitoring loop.
" Setting <6> of register 0x13 includes the 2.5 V channel
in the monitoring loop.
" Setting <7> of register 0x13 includes the Vcc channel
in the monitoring loop.
Voltage Measurement Resolution
The NCT7491 uses a reference voltage of 2 V. The ADC
is 10bit giving a resolution of 1.953 mV per lsb. This is the
resolution that applies when the attenuators are disabled.
With attenuators enabled the resolution for each channel is
as follows:
" 12 V resolution = 15.92 mV per lsb
" 5 V resolution = 6.54 mV per lsb
" 2.5 V resolution = 3.26 mV per lsb
" Vccp resolution = 2.93 mV per lsb
" Vcc resolution = 4.29 mV per lsb
" V
TT
resolution = 2.2 mV per lsb
Voltage Limit Registers
Associated with each voltage measurement channel is a
high and low limit register. Exceeding the programmed high
or low limit causes the appropriate status bit to be set.
Exceeding either limit can also generate SMBALERT
interrupts.
" Reg. 0x84, V
TT
Low Limit
" Reg. 0x86, V
TT
High Limit
" Reg. 0x44, 2.5 V Low Limit
" Reg. 0x45, 2.5 V High Limit
" Reg. 0x46, V
CCP
Low Limit
" Reg. 0x47, V
CCP
High Limit
" Reg. 0x48, V
CC
Low Limit
" Reg. 0x49, V
CC
High Limit
" Reg. 0x4A, 5 V Low Limit
" Reg. 0x4B, 5 V High Limit
" Reg. 0x4C, 12 V Low Limit
" Reg. 0x4D, 12 V High Limit
Additional ADC Functions for Voltage Measurements
A number of other functions are available on the
NCT7491 to offer the system designer increased flexibility.
The functions described below are enabled by setting the
appropriate bit in configuration register 2 (0x73).
TurnOff Voltage Averaging
The averager length that is applied to the temperature
readings is also applied to the voltage readings. The averager
length is programmable as 4, 8, 16 or 32 samples. These
values can be selected in register 0x40 bits <7:6>.
When faster conversions are needed, setting Bit 3 of
Configuration Register 2 (Reg. 0x73) turns voltage
averaging off. This gives a faster reading, but the reading
can be noisier. The default roundrobin cycle time takes
TBD ms.
Bypass Individual Voltage Input Attenuators
Bits <7:3> of Configuration Register 4 (0x7D) can be
used to bypass individual voltage channel attenuators.
Table 30. BYPASSING VOLTAGE ATTENUATORS
Configuration Register 4 (0x7D)
Bit
Channel Attenuated
3
Bypass V
TT
attenuator
4
Bypass 2.5 V attenuator
5
Bypass V
CCP
attenuator
6
Bypass 5 V attenuator
7
Bypass 12 V attenuator
The input range of the ADC without the attenuators is 0 V
to 2 V.
GPIO Functions
There are up to 3 pins that can be configured as opendrain
general purpose digital I/O pins. These are pins 5 (GPIO1),
6 (GPIO2) and 19 (GPIO3) on the QSOP package and pins
2 (GPIO1), 3 (GPIO2) and 16 (GPIO3) on the QFN package.
GPIO1 and GPIO2 are shared with the SMBus Master Port
pins SCL_M and SDA_M. GPIO3 is shared with THERM
and SMBALERT functions.
There are 2 bits that must be programmed to enable the
GPIO1 and GPIO2 functions:
" Setting bit 1 of register 0x80 to 1 enables GPIO1 and
GPIO2
" Clearing bit 0 of register 0xB5 to 0 disables the SMBus
Master Port. This bit has priority over the GPIO enable
bit so must be cleared for GPIOs to function.
GPIO3 is enabled by setting bits <3:2> of register 0x7C to
<10>.
Each GPIO pin has associated direction, polarity and data
bits.
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