参数资料
型号: 71M6542G-IGTR/F
厂商: MAXIM INTEGRATED PRODUCTS INC
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PQFP100
封装: LEAD FREE, LQFP-100
文件页数: 120/165页
文件大小: 2208K
代理商: 71M6542G-IGTR/F
58
2008–2011 Teridian Semiconductor Corporation
v1.1
Refer to the 71M6xxx Data Sheet for information on reading the VCC sensor in the 71M6x01 devices.
2.5.7
UART and Optical Interface
The 71M6541D/F and 71M6542F provide two asynchronous interfaces, UART0 and UART1. Both can be
used to connect to AMR modules, user interfaces, etc., and also support a mechanism for programming the
on-chip flash memory.
Referring to Figure 19, UART1 includes an interface to implement an IR/optical port. The pin OPT_TX is
designed to directly drive an external LED for transmitting data on an optical link. The pin OPT_RX has
the same threshold as the RX pin, but can also be used to sense the input from an external photo detector
used as the receiver for the optical link. OPT_TX and OPT_RX are connected to a dedicated UART port
(UART1).
The OPT_TX and OPT_RX pins can be inverted with configuration bits OPT_TXINV (I/O RAM 0x2456[0])
and OPT_RXINV (I/O RAM 0x2457[1]), respectively. Additionally, the OPT_TX output may be modulated at
38 kHz. Modulation is available in MSN and BRN modes (see Table 67). The OPT_TXMOD bit (I/O RAM
0x2456[1]) enables modulation. The duty cycle is controlled by OPT_FDC[1:0] (I/O RAM 0x2457[5:4]) ,
which can select 50%, 25%, 12.5%, and 6.25% duty cycle. A 6.25% duty cycle means that OPT_TX is
low for 6.25% of the period.
When not needed for UART1, OPT_TX can alternatively be configured as SEGDIO51. Configuration is
via the OPT_TXE[1:0] (I/O RAM 0x2456[3:2]) field and LCD_MAP[51] (I/O RAM 0x2405[0]). The
OPT_TXE[1:0] field allows the MPU to select VPULSE, WPULSE, SEGDIO51 or the output of the pulse
modulator to be sourced onto the OPT_TX pin. Likewise, the OPT_RX pin can alternately be configured
as SEGDIO55, and its control is OPT_RXDIS (I/O RAM 0x2457[2]) and LCD_MAP[55] (I/O RAM 0x2405[4]).
B
A
OPT_TXMOD = 0
OPT_TXMOD = 1,
OPT_FDC = 2 (25%)
B
A
1/38kHz
OPT_TXINV
from
OPT_TX UART
MOD
EN
DUTY
OPT_TX
OPT_TXMOD
OPT_FDC
OPT_TXE[1:0]
1
2
V3P3
Internal
A
B
0
2
3
DIO2
WPULSE
VARPULSE
Figure 18: Optical Interface
Bit Banged Optical UART (Third UART)
As shown in Figure 19, the 71M654x can also be configured to drive the optical UART with a DIO signal
in a bit banged configuration. When control bit OPT_BB (I/O RAM 0x2022[0]) is set, the optical port is
driven by DIO5 and the SEGDIO5 pin is driven by UART1_TX. This configuration is typically used when
the two dedicated UARTs must be connected to high speed clients and a slower optical UART is
permissible.
相关PDF资料
PDF描述
71M6541G-IGTR/F SPECIALTY ANALOG CIRCUIT, PQFP64
71M6541F-IGTR/F SPECIALTY ANALOG CIRCUIT, PQFP64
71M6541D-IGTR/F SPECIALTY ANALOG CIRCUIT, PQFP64
71M6542F-IGTR/F SPECIALTY ANALOG CIRCUIT, PQFP100
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