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TLV5633C Datasheet(PDF) 14 Page - Texas Instruments

Part No. TLV5633C
Description  2.7 V TO 5.5 V LOW POWER 12-BIT DIGITAL-TO-ANALOG CONVERTERS WITH INTERNAL REFERENCE AND POWER DOWN
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TLV5633C Datasheet(HTML) 14 Page - Texas Instruments

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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
DVDD
8
8
8
16
8
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
TLV5633C
TLV5633I
SLAS190C – MARCH 1999 – REVISED SEPTEMBER 2006
The circuit in Figure 15 shows how to interface the TLV5633 to an Intel MCS®51 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 MCS®51 Controller
14
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