A6850 9 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000;" />
參數(shù)資料
型號: A6850KLTR-T
廠商: Allegro Microsystems Inc
文件頁數(shù): 12/12頁
文件大?。?/td> 0K
描述: IC SWITCH INTERFACE 2CHAN 8-SOIC
標(biāo)準(zhǔn)包裝: 1
類型: 霍爾效應(yīng)開關(guān)
輸入類型: 電壓
輸出類型: 電壓
接口: 2 線串口
電流 - 電源: 5mA
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOICN
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁面: 1141 (CN2011-ZH PDF)
其它名稱: 620-1185-6
Dual Channel Switch Interface IC
A6850
9
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Mechanical Switch Interfacing
The A6850 can be used as an interface between mechanical
switches, set in a switch-to-ground configuration, and a low
voltage microprocessor. A series resistor must be placed in
the circuit to limit current when the mechanical switch is
closed, in order to prevent excessive power dissipation in the
A6850.
For example, to calculate the power dissipation in the A6850
driving two mechanical switches with 1 kΩ series resistors,
with VIN = 12 V, assume that the current limit for each of
the outputs is set to the maximum value, IOUTPUTM(max) =
45 mA.
When the mechanical switch is closed without a series resis-
tor, the A6850 will be at the current limit. The full 12 V of the
power supply will drop across the A6850 at 45mA The power
dissipation for one mechanical switch closed would be:
PD1 = VDrop1 × IOUTPUT1
(6)
= 12 V × 45 mA
= 540 mW
A series resistor included in the circuit reduces power dis-
sipation in the OUTPUTx section of the A6850.
The current is then limited to:
IOUTPUT1 = VIN / (35 + RSERIES)
(7)
= 12 V / 1035 Ω
= 11.59 mA
VDrop1 = 35 × IOUTPUT1
(8)
= 405.7 mV
The power dissipation in the A6850 from this switch is much
lower:
PD1 = VDrop1 × IOUTPUT1
(9)
= 0.4057 V × 11.3 mA
= 4.58 mW
Figure 6. Typical Application with Mechanical Switches
Controller
Input1
VIN
GROUND
A6850
Wiring Harness
OUTPUT1
OUTPUT2
8
5
1
3
2
4
6
7
SENSE2
R
SERIES
R
SERIES
SENSE1
ENABLE2
ENABLE1
VCC or
VBAT
Input2
RSENSE1
RSENSE2
Digital Output
VCC
1 F
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