參數(shù)資料
型號(hào)： AS1504-T
廠商： AUSTRIAMICROSYSTEMS AG
元件分類(lèi)： DAC
英文描述： Octal, 8-bit, Mid-Scale Reset; Package Type: SOIC(150mil)-16
中文描述： 八進(jìn)制8位可編程低功耗DAC的具有關(guān)斷和中間刻度重置
封裝： SOIC(150mil)-16
文件頁(yè)數(shù)： 14/17頁(yè)
文件大?。?/td> 471K
代理商： AS1504-T
www.austriamicrosystems.com
Revision 1.0
14 - 17
AS1504/AS1505
Data Sheet
- Application Information
Microprocessor Interfaces
The AS1504/AS1505 serial interface provides a simple connection to a wide range of microprocessors, most of which
have built-in serial data capability that can be used for communicating with the device.
Note:
In cases where a serial port is not available on the microprocessor, the AS1504/AS1505 can be addressed via
software.
Eleven data bits are required to load data into the AS1504/AS1505 (3 bits for the DAC address and 8 bits for the DAC
value). If more than eleven bits are transmitted before the microprocessor chip select input goes high, the most-signifi-
cant bits are ignored. Because most microprocessors transmit data in 8-bit words, it will need to send 16 bits to the
AS1504/AS1505; however, the AS1504/AS1505 only responds to the last 11 bits clocked into the SDI input, so the
serial data interface is not affected.
8051 Microprocessor Interface
Figure 22
shows the AS1504/AS1505 interface to an 8051 microprocessor. This interface uses the 8051 internal serial
port as a simple 8-bit shift register (Mode 0 operation). 8051 Port3.0 serves as the serial data output port and Port3.1
serves as the serial clock.
Figure 22. AS1504-to-8051 Microprocessor Interface
As data is written to the serial buffer register (SBUF, at Special Function Register location 99
h
), the data is automati-
cally converted to serial format and clocked out via Port3.0 and Port3.1. Once 8 bits have been transmitted, the trans-
mit interrupt flag (SCON.1) is set and the next 8 bits can be transmitted.
The AS1504/AS1505 requires that CSN goes low at the start of the serial data transfer. Additionally, pin CLK must be
high when CSN goes high at the end of each data transfer. The 8051 serial clock meets these requirements, since
Port3.1 begins and ends the serial data transfer in a high state.
AS1504
OUT8
OUT1
SDI
CLK
RSN
SHDNN
CSN
8051
Port3.0
Port3.1
Port1.3
Port1.2
Port1.1
RX
TX
Serial Data
Shift Register
Shift Clock
1.1
1.2
1.3
Port 1
V
DD
V
REFH
0.1μF
10μF
Tantalum
+
+5V
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