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參數(shù)資料
| 型號： | MAX9921AUB/V+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC HALL EFFECT SENSOR DL 10UMAX |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 霍爾效應(yīng)傳感器 |
| 輸入類型： | 電壓 |
| 輸出類型： | 邏輯 |
| 接口： | 2 線 |
| 電流 - 電源： | 1.3mA |
| 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-µMAX |
| 包裝： | 帶卷 (TR) |
MAX9921
Dual, 2-Wire Hall-Effect Sensor Interface
with Diagnostics
______________________________________________________________________________________
11
Hall Sensor Protection from Supply Transients
If the VBAT voltage is lower than 6V or exceeds 18V,
IN1 and IN2 shut off current to both Hall sensors and
ERR, OUT1, and OUT2 go low. When VBAT returns to
the proper range, both IN1 and IN2 restart, following a
blanking cycle.
Hall Inputs Open Condition
If either IN1 or IN2 is open (IIN < 2mA), the correspond-
ing input shuts off current to the Hall sensor. If IN1 or
IN2 is loaded, it exits the open input fault condition and
restarts the corresponding Hall input, following a blank-
ing cycle.
Hall Input Shorted to Battery
If either IN1 or IN2 is shorted to the battery (VIN > VBAT
+ 100mV), the MAX9921 shuts off current to the corre-
sponding Hall sensor. In this case, if IN1 or IN2 is more
than 1V above VBAT, it may back-drive current into
BAT. In such a condition, the current level in the Hall
input should not exceed 100mA. Therefore, all the
MAX9921s together can share a separate reverse-
polarity protection diode to avoid powering up other cir-
cuitry sharing a common diode (Figure 3).
INPUT
OUTPUT
DIAG
ERR
OUT1
OUT2
DIAGNOSIS
1
0
No fault
1
0
1
IN1 open circuit, or IN1 open circuit and fault on IN2
1
0
1
0
IN1 shorted to battery, or IN1 shorted to battery and fault on IN2
1
0
1
IN1 shorted to ground, or IN1 shorted to ground and fault on IN2
11
0
VBAT out of range, or power-up or restart and blanking cycle (dominant
fault masks all other faults)
1
0
1
IN2 open circuit
1
0
IN2 shorted to battery
1
IN2 shorted to ground
Table 2. Diagnostic Truth Table (Diagnostic Mode)
BAT
ISET
MAX9921
IN1
IN2
GND
DIAG
OE
ERR
OUT1
OUT2
BAT
GND
OTHER
CIRCUITRY
RISET
BATTERY
REVERSE-POLARITY DIODE
FOR MAX9921s
REVERSE-POLARITY DIODE
FOR OTHER CIRCUITRY
RISET
ISET
MAX9921
IN1
IN2
GND
DIAG
OE
ERR
OUT1
OUT2
Figure 3. Several MAX9921s Connected to a Common Reverse-Polarity Diode
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