參數(shù)資料
型號(hào)： TLV5633IPW
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： DAC
英文描述： PARALLEL, WORD INPUT LOADING, 3.5 us SETTLING TIME, 12-BIT DAC, PDSO20
封裝： GREEN, PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 6/25頁(yè)
文件大小： 486K
代理商： TLV5633IPW
www.ti.com
TLV5633 INTERFACED to an Intel MCS
51 Controller
P2 A(15-8)
P0 AD(7-0)
ALE
WR
D(7-0)
A
B
C
G1
G2A
G2B
A(1-0)
D(7-0)
CS
WE
REF
A(15-0)
AD(7-0)
CS(7-0)
DVDD
8
16
8
RL
74AC373
8xC51
74AC138
TLV5633
A15
A2
A3
A4
2
Q(7-0)
Y(7-0)
G2A
SPD
PWR
LDAC
LE
OE
OUT
To Other Devices Requiring
Voltage Reference
P3.5
SLAS190C – MARCH 1999 – REVISED SEPTEMBER 2006
The circuit in Figure 15 shows how to interface the TLV5633 to an Intel MCS51 microcontroller. The address
bus and the data bus of the controller are multiplexed on port 0 (non page mode) to save port pins. To separate
the address bits and the data bits, the controller provides a dedicated signal, address latch enable (ALE), which
is connected to a latch at port 0.
An address decoder is required to generate the chip select signal for the TLV5633. In this example, a simple
3-to-8 decoder (74AC138) is used for the interface as shown in Figure 15. The DAC is memory mapped at
addresses 0x8000/1/2/3 within the data memory address space and mirrored every 32 address locations
(0x8020/1/2/3, 0x8040/1/2/3, etc.). In a typical microcontroller system, programmable logic should be used to
generate the chip select signals for the entire system.
The data pins and the WE pin of the TLV5633 can be connected directly to the multiplexed address and data
bus and the WR signal of the controller.
The application uses the TLV5633 device's internal reference at 2.048 V. The LDAC pin is connected to P3.5
and is used to update the DAC after both data bytes have been written.
Figure 15. TLV5633 Interfaced to an Intel MCS51 Controller
14
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