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参数资料
| 型号： | AM512BVD |
| 厂商： | RENISHAW PLC |
| 元件分类： | 磁阻传感器 |
| 英文描述： | MAGNETIC FIELD SENSOR-HALL EFFECT, 1-4 V, SQUARE, SURFACE MOUNT |
| 封装： | ROHS COMPLIANT, LQFP-44 |
| 文件页数： | 17/22页 |
| 文件大小： | 608K |
| 代理商： | AM512BVD |
Data sheet
AM512BD01_04
Issue 4, 14
th January 2009
2009 RLS d.o.o.
A
associate company
4
Pins 1 and 2 are used for OTP (One Time Programming) of the chip. The OTP is carried out at the factory
and defines the behavior and accuracy of the AM512B. In operation pin 1 (Prog) must be connected to Vss
and pin 2 (Prg) must be unconnected.
Pin 3 (Error) is an analogue output signal. It can be used for monitoring the alignment between the AM512B
and the magnet. See the “Error signal” section on page 15 for detailed information.
Pins 4 and 5 are Cosine and Sine output signals for monitoring and filtering. A low-pass filter can be made
with an external capacitor as there is a built-in 10 k serial resistor. Recommended value for filtering is a
10 nF capacitor connected to Vss. When a 10 nF capacitor is used for filtering the position information is
delayed by an additional 10 s. See the “Position delay” section on page 11 for detailed information.
Pins 6, 7, 28 and 39 are not connected internally. They can be left unterminated.
Pins 8, 9, 10, 11, 14, 15, 16, 18, 19 are output pins. The function of each pin is changed when the output
mode is changed. See the “Pin description” table on page 3.
Pins 12, 22, 34, 44 are back plane pins which must be connected to Vss.
Pins 13, 17, 23, 25, 26, 29, 30, 31, 32, 33, 43 are power supply pins. All pins must be connected.
Pin 20 (CS) is a digital input with an internal pull-down resistor. When high, all digital output pins (D8-D0)
are set to high impedance mode. This function can be used when several AM512B devices are used in
parallel mode.
Pin 21 (Clock) is a digital input for serial SSI communication. See the “Binary synchronous serial output SSI”
section on page 7 for detailed information.
Pin 24 (RefN) is a reference voltage input for minimum value of the linear output voltage (Vout).
Pin 27 (DL) is a digital input with an internal pull-down resistor. The pin is used to latch (freeze) all 9 bits of
information. It is used only for parallel output mode. When serial output mode is selected, the signal has no
effect.
DL
Function (parallel output mode)
Low
Parallel output is constantly refreshed
High
Parallel output information is latched
Pin 35 (RefP) is a reference voltage input for maximum value of the linear output voltage (Vout).
Pin 36 (Agnd) is a buffered analogue reference output. It is a reference voltage for analogue sinusoidal
signals. It is used by the interpolator and for analogue signal outputs.
Pin 37 (Agndi) is an internally generated reference voltage. It is generated with a Vdd/Vss resistor divider.
The resistors values are 20 k and 30 k. The reference voltage is 3 V typically (3/5 of power supply
voltage). Agndi must be connected to an external 100 nF capacitor. The reference voltage value can be
changed to 1/2 of supply voltage by connecting the pin 41 (R25) to Vss.
Pin 38 (Ihal) is used to define the system sensitivity. When a resistor (RIhal) is connected from pin 38 (Ihal) to
Vdd a hall sensor bias current is defined. Recommended value for RIhal is 18 k. The value of RIhal can be
altered to adjust the sensitivity. See the RIhal/Signal amplitude characteristic chart (Figure 32, page 18).
Pin 40 (Iboh) is used to define the amplifiers bias current. When a resistor (RIboh) is connected between pin
40 (Iboh) and Vss amplifiers bias current is defined. The value RIboh must be 82 k.
Pin 41 (R25) is used for setting the voltage level of Agnd (open = 3/5 Vdd, low = 1/2 Vdd).
Pin 42 (PS) is a digital input pin with an internal pull-down resistor for selecting the output operation mode.
PS
Output mode
Low
Parallel output mode
High
Serial, incremental and linear output mode
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