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参数资料
| 型号： | XR20V2172L64-0B-EB |
| 厂商： | Exar Corporation |
| 文件页数： | 34/51页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR XR20V2170 64QFN |
| 标准包装： | 1 |
| 系列： | * |
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XR20V2172
4
TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER
REV. 1.0.2
DTRA
DTRB
41
12
O
UART Data-Terminal-Ready. See MCR[0].
DSRA
DSRB
40
14
I
UART Data-Set-Ready. This input has an internal pull-down resistor and
can be left unconnected when not used. See MSR[5].
CDA
CDB
60
62
I
UART Carrier-Detect. This input has an internal pull-down resistor and
can be left unconnected when not used. See MSR[7].
RIA
RIB
58
13
I
UART Ring-Indicator. This input has an internal pull-down resistor and
can be left unconnected when not used. See MSR[6].
Ancillary signals (CMOS/TTL Voltage Levels)
XTAL1
15
I
Crystal or external clock input. This pin is not 5V tolerant.
XTAL2
17
O
Crystal or buffered clock output.
ACP
24
I
Autosleep for Charge Pump (active HIGH). When this pin is HIGH, the
charge pump is shut off if the V2172 is already in partial sleep mode, i.e.
the crystal oscillator is stopped. This pin is 5V tolerant.
FAST
19
I
When FAST is HIGH, the maximum serial data rate is 1 Mbps.
When FAST is LOW, the maximum serial data rate is 250 Kbps. This pin
is 5V tolerant.
R_EN
20
I
When the supply voltage is < 3.6V, connect R_EN to VCC.
When the supply voltage is > 3.6V, connect R_EN to GND. This pin is 5V
tolerant.
RXB_SEL
6
I
When RXB_SEL is HIGH, RXB is the receive data input.
When RXB_SEL is LOW, RXDB is the receive data input. This pin is 5V
tolerant.
C2+
C2-
44
43
-
Charge pump capacitors. As shown in Figure 1, a 0.1 uF capacitor
should be placed between these 2 pins.
C1+
C1-
51
50
-
Charge pump capacitors. As shown in Figure 1, a 0.1 uF capacitor
should be placed between these 2 pins.
C3
56
-
When the supply voltage is 3.3 V, C3 should be connected to VCC.
When the supply voltage is 5 V, C3 should be connected to a 1 uF capac-
itor to GND.
VREF-
25
Pwr
-5.0V generated by the charge pump.
VREF+
53
Pwr
+5.0V generated by the charge pump.
GND
1, 16, 21, 35
Pwr
Power supply common, ground.
VCC
45, 54
Pwr
3.3 to 5.5V power supply.
Pin Description
NAME
64-QFN
PIN #
TYPE
DESCRIPTION
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相关代理商/技术参数 |
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