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參數(shù)資料
| 型號(hào)： | MIC74BQS |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 7/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC I/O EXPANDER I2C 8B 16QSOP |
| 標(biāo)準(zhǔn)包裝： | 98 |
| 接口： | I²C，SM 總線 |
| 輸入/輸出數(shù)： | 8 |
| 中斷輸出： | 是 |
| 電源電壓： | 2.7 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-QSOP |
| 包裝： | 管件 |
Micrel, Inc.
MIC74
October 2006
15
M9999-101006
The act of reading STATUS clears it in preparation for
detecting future events. The status bits corresponding to
I/O’s configured as outputs or corresponding to P[7:4]
when in fan mode will not be set by state changes on
these pins. It is always good practice, however, for the
interrupt service routine to mask the value obtained
when reading STATUS to eliminate any bits, output or
otherwise, that are not of immediate concern. This will
help avoid problems if software changes are made in the
future.
The process for writing output data is straight-forward—
simply write the desired bit pattern to DATA. Special
precautions may be required, however, when changing
output data in an interrupt driven system. See the
discussion below under “Writing to the Data Register.”
Read STATUS to
determine source
Read alert
response address
Interrupts
pending
?
No
Yes
Is
Sx set
?
No
Yes
Interrupt Service
Routine
Return from ISR
Service function x
Is
interrupt
from
MIC74
Yes
No
Service other devices
Is
Sm set
?
No
Yes
Service function m
Is
Sn set
?
No
Yes
Service function n
Figure 11: Interrupt Service Routine Using the ARA
Writing To The Data Register
Multiple software routines may use the various output
bits available on the MIC74 to control individual functions
such as power switches, LED’s, etc. These various
functions may be handled by independent software
routines which must manipulate individual output bits
without regard for other bits. Care must be taken to
insure that these various software routines do not
interfere with each other when modifying output data.
The recommended procedure for changing isolated
output bits is as follows:
1. Read DATA
2. Set desired bits by ORing the value read from
DATA with an appropriate mask value
3. Clear desired bits by ANDing the value read
from DATA with an appropriate mask value
4. Write the result back to DATA
A functionally equivalent alternative to this procedure is
to keep an image of the data register in software. Any
independent routines would make changes to this image
using the procedure above and then call a routine that
actually writes the new image to DATA. Interrupts would
be disabled briefly while DATA is being modified.
Read
STATUS
Is
Sx set
?
No
Yes
Polled
I.S.R.
Service function x
Is
STATUS
h
?
Yes
No
Is
Sm set
?
No
Yes
Service function m
Is
Sn set
?
No
Yes
Service function n
Service other devices
Return from ISR
Figure 12: Interrupt Service Routine Without ARA
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC74BQS TR | 功能描述:IC I/O EXPANDER I2C 8B 16QSOP RoHS:否 類別:集成電路 (IC) >> 接口 - I/O 擴(kuò)展器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 接口:I²C，JTAG 輸入/輸出數(shù):9 中斷輸出:無 頻率 - 時(shí)鐘:400kHz 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 包括:EEPROM |
| MIC74BWM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC74YQS | 功能描述:接口-I/O擴(kuò)展器 2-Wire Serial I/O Expander & Fan Controller, QSOP-16 - Lead Free RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MIC74YQS TR | 功能描述:接口-I/O擴(kuò)展器 2-Wire Serial I/O Expander & Fan Controller, QSOP-17 - Lead Free RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MIC79050 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Simple Lithium-Ion Battery Charger Preliminary Information |
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