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參數(shù)資料
| 型號： | MAX7348AEP+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC KEY SWITCH 2WIRE 20-QSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 應(yīng)用： | 聲卡，播放器，記錄器 |
| 接口： | I²C |
| 電源電壓： | 2.4 V ~ 3.6 V |
| 封裝/外殼： | 20-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-QSOP |
| 包裝： | 管件 |
| 安裝類型： | 表面貼裝 |
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MAX7347/MAX7348/MAX7349
2-Wire Interfaced Low-EMI Key Switch
and Sounder Controllers
14
______________________________________________________________________________________
Key-Scan Registers
Eight key-scan registers are described in the following
sections.
Keys FIFO Register
The keys FIFO register contains the information pertain-
ing to the status of the keys FIFO, as well as the key-
press events that have been debounced (Table 8). Bits
D0 to D5 denote which of the 64 keys have been
debounced and the keys are numbered as in Table 2
and Figure 1. D6 indicates whether the present
debounced key is the last one in the FIFO, with 1
denoting that there are more keys after the present one,
and 0 denoting that the present debounced key is the
last one stored in the FIFO. D7 is the overflow flag,
which denotes whether the keys FIFO has overflowed.
Reading the key-scan FIFO clears the interrupt INT. INT
is only reasserted after the FIFO has been emptied by
performing enough read operations.
Debounce Register
The debounce register sets the time for each debounce
cycle, as well as setting whether the GPO ports are
enabled or disabled. Bits D0 through D4 set the
debounce time in increments of 1ms starting at 9ms
and ending at 40ms (Table 9). Bits D5 through D7 set
which one of the GPO ports is to be enabled. Note that
not any port can be enabled at a particular time. The
GPO ports can be enabled only in the combinations
shown in Table 9, from all disabled to all enabled.
Autorepeat Register
The autorepeat register sets the autorepeat frequency
(repeat rate) and its delay. The autorepeat function allows
a key to be consecutively asserted when the key itself is
pressed down without being released. The autorepeat
delay specifies the delay between the first press and the
beginning of the autorepeating, provided that the key has
not been released. The autorepeat frequency specifies
how fast the continuously pressed-down key to be assert-
ed once autorepeating has started is. Bits D0 through D3
specify the autorepeat delay in terms of debounce cycles
REGISTER
ADDRESS CODE
(hex)
REGISTER DATA
D7
D6
D5
D4
D3
D2
D1
D0
DEBOUNCE REGISTER
0x01
PORTS ENABLE
DEBOUNCE TIME
Debounce time is 9ms
0x01
X
0000
0
Debounce time is 10ms
0x01
X
0000
1
Debounce time is 11ms
0x01
X
0001
0
Debounce time is 12ms
0x01
X
0001
1
All the way through to
0x01
X
————
—
Debounce time is 37ms
0x01
X
1110
0
Debounce time is 38ms
0x01
X
1110
1
Debounce time is 39ms
0x01
X
1111
0
Debounce time is 40ms
0x01
X
1111
1
GPO ports disabled (full key-scan functionality)
0x01
0
XXXX
X
GPO port 7 enabled
0x01
0
1
XXXX
X
GPO ports 7 and 6 enabled
0x01
0
1
0
XXXX
X
GPO ports 7, 6, and 5 enabled
0x01
0
1
XXXX
X
GPO ports 7, 6, 5, and 4 enabled
0x01
1
0
XXXX
X
GPO ports 7, 6, 5, 4, and 3 enabled
0x01
1
0
1
XXXX
X
GPO ports 7, 6, 5, 4, 3, and 2 enabled
0x01
1
XXXXX
X
Power-up default setting
0x01
1
111111
1
Table 9. Debounce Register Format
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7348AEP+ | 功能描述:外圍驅(qū)動器與原件 - PCI Low-EMI Key Switch & Sounder Controller RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| MAX7348AEP+T | 功能描述:外圍驅(qū)動器與原件 - PCI Low-EMI Key Switch & Sounder Controller RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| MAX7348AEP-T | 功能描述:外圍驅(qū)動器與原件 - PCI Low-EMI Key Switch & Sounder Controller RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| MAX7349 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:2-Wire Interfaced Low-EMI Key Switch and Sounder Controllers |
| MAX7349AEG | 功能描述:外圍驅(qū)動器與原件 - PCI Low-EMI Key Switch & Sounder Controller RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
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