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參數(shù)資料
| 型號： | AD7992BRMZ-1REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 18/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 2CHAN I2C 10MSOP |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 79k |
| 數(shù)據(jù)接口： | I²C，串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 2.2mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 2 個單端，單極 |
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AD7992
Rev. 0 | Page 24 of 28
ALERT/BUSY PIN
The ALERT/BUSY pin may be configured as an ALERT output
or BUSY output, as shown in Table 11.
SMBus ALERT
The AD7992 ALERT output is an SMBus interrupt line for
devices that want to trade their ability to master for an extra
pin. The AD7992 is a slave-only device and uses the SMBus
ALERT to signal the host device that it wants to talk. The
SMBus ALERT on the AD7992 is used as an out-of-conversion-
range indicator (a limit violation indicator).
The ALERT pin has an open-drain configuration that allows the
ALERT outputs of several AD7992s to be wire-AND’ed together
when the ALERT pin is active low. D0 of the configuration
register is used to set the active polarity of the ALERT output.
The power-up default is active low. The ALERT function can be
disabled or enabled by setting D2 of the configuration register
to 0 or 1, respectively.
The host device can process the ALERT interrupt and simul-
taneously access all SMBus ALERT devices through the alert
response address. Only the device that pulled the ALERT low
acknowledges the ARA (alert response address). If more than
one device pulls the ALERT pin low, the highest priority (lowest
address) device wins communication rights via standard I2C
arbitration during the slave address transfer.
The ALERT output becomes active when the value in the
conversion result register exceeds the value in the DATAHIGH
register or falls below the value in the DATALOW register for a
selected channel. It is reset when a write operation to the
configuration register sets D1 to a 1, or when the conversion
result returns N LSBs below or above the value stored in the
DATAHIGH register or DATALOW register, respectively. N is the
value in the hysteresis register (see the Limit Registers section).
The ALERT output requires an external pull-up resistor that
can be connected to a voltage different from VDD provided the
maximum voltage rating of the ALERT output pin is not
exceeded. The value of the pull-up resistor depends on the
application, but should be as large as possible to avoid excessive
sink currents at the ALERT output.
PLACING THE AD7992-1 INTO HIGH SPEED MODE
High speed mode communication commences after the master
addresses all devices connected to the bus with the master code,
00001XXX, to indicate that a high speed mode transfer is to
begin. No device connected to the bus is allowed to acknowl-
edge the high speed master code; therefore, the code is followed
by a not acknowledge (see Figure 30). The master must then
issue a repeated start followed by the device address with a R/W
bit. The selected device then acknowledges its address.
All devices continue to operate in high speed mode until the
master issues a STOP condition. When the STOP condition is
issued, the devices all return to fast mode.
THE ADDRESS SELECT (AS) PIN
The address select pin on the AD7992 is used to set the I2C
address for the AD7992 device. The AS pin can be tied to VDD,
to AGND, or left floating. The selection should be made as close
as possible to the AS pin; avoid having long tracks introducing
extra capacitance onto the pin. This is important for the float
selection, because the AS pin has to charge to a midpoint after
the start bit during the first address byte. Extra capacitance on
the AS pin increases the time taken to charge to the midpoint
and may cause an incorrect decision on the device address.
When the AS pin is left floating, the AD7992 can work with a
capacitive load up to 40 pF.
SDA
ACK. BY
AD7992
START BY
MASTER
HS-MODE MASTER CODE
SERIAL BUS ADDRESS BYTE
NACK
19
1
9
0
1
A2
A1
A0
X
1
0
SCL
0
A3
X
Sr
FAST MODE
HIGH SPEED MODE
03263-0-011
Figure 30. Placing the Part into High Speed Mode
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