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參數(shù)資料
| 型號： | TLV5614IYZR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 9 us SETTLING TIME, 12-BIT DAC, UUC16 |
| 封裝： | GREEN, DIE-16 |
| 文件頁數(shù)： | 9/25頁 |
| 文件大小： | 500K |
| 代理商： | TLV5614IYZR |
www.ti.com
TLV5614IYZ INTERFACED TO MCS
51 MICROCONTROLLER
Hardware Interfacing
RxD
TxD
P3.3
P3.4
MCS 51
SDIN
SCLK
FS
CS
LDAC
REF
V
DD
PD
VOUTA
VOUTB
VOUTC
VOUTD
V
SS
TLV5614IYZ
P3.4
REFINAB
REFINCD
Software
SBAS401 – DECEMBER 2006
lacl * ; get DAC a sample into accumulator
or #DACc_control ; OR in DAC C control bits
sacl temp ;
out temp, SDTR; send data
rpt #016h ; wait long enough for this configuration
nop ; of MCLK/CLKOUT1 rate
; DAC D
lar ar0, dacd_ptr; ar0 points to DAC a sample
lacl * ; get DAC a sample into accumulator
or #dacd_control ; OR in DAC D control bits
sacl temp ;
out temp, SDTR; send data
lacl r_ptr ; load rolling pointer to accumulator
add #1h ; increment rolling pointer
and #001Fh ; count 0-31 then wrap back round
sacl r_ptr ; store rolling pointer
rpt #016h ; wait long enough for this configuration
nop ; of MCLK/CLKOUT1 rate
; now take CS high again
lacl iosr_stat ; load acc with iosr status
or #0001h ; set IO0 - CS high
sacl temp ;
out temp, IOSR;
clrc intm ; re-enable interrupts
ret ; return from interrupt
.end
Figure 18 shows an example of how to connect the TLV5614IYZ to an MCS51 Microcontroller. The serial DAC
input data and external control signals are sent via I/O Port 3 of the controller. The serial data is sent on the RxD
line, with the serial clock output on the TxD line. Port 3 bits 3, 4, and 5 are configured as outputs to provide the
DAC latch update (LDAC), chip select (CS) and frame sync (FS) signals for the TLV5614IYZ. The active low
power-down pin (PD) of the TLV5614IYZ is pulled high to ensure that the DACs are enabled.
Figure 18. TLV5614IYZ Interfaced With MCS51
The example is the same as for the TMS320C203 in this data sheet, but adapted for a MCS51 controller. It
generates a differential in-phase (sine) signal between the VOUTA and VOUTB pins, and its quadrature (cosine)
signal is the differential signal between VOUTC and VOUTD.
The on-chip timer is used to generate interrupts at a fixed frequency. The related interrupt service routine pulses
LDAC low to update all four DACs simultaneously, then fetches and writes the next sample to all four DACs. The
samples are stored as a look-up table, that describes one full period of a sine wave.
17
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