Rainbow Electronics MAX5131 - Manual (Page 11)

Power-Down Lockout Input (
PDL
)
The power-down lockout pin (PDL) disables shutdown
when low. When in shutdown mode, a high-to-low tran-
sition on PDL will wake up the DAC with its output still
set to the state prior to power-down. PDL can also be
used to wake up the device asynchronously.
Power-Down Input (PD)
Pulling PD high places the MAX5130/MAX5131 in shut-
down mode. Pulling PD low will not return the MAX5130/
MAX5131 to normal operation. A high-to-low transition
on PDL or appropriate commands (Table 1) via the ser-
ial interface are required to exit power-down.
Serial-Interface Configuration
(SPI/QSPI/MICROWIRE/PIC16/PIC17)
The MAX5130/MAX5131 3-wire serial interface is com-
patible with SPI, QSPI, PIC16/PIC17 (Figure 4) and
MICROWIRE (Figure 5) interface standards. The 2-byte-
long serial input word contains three control bits and 13
data bits in MSB-first format (Table 2).
The MAX5130/MAX5131’s digital inputs are double
buffered, which allows the user to:
•
Load the input register without updating the DAC
register,
•
Update the DAC register with data from the input
register,
•
Update the input and DAC registers concurrently.
MAX5130/MAX5131
+3V/+5V, 13-Bit, Serial Voltage-Output DACs
with Internal Reference
______________________________________________________________________________________ 11
Load input register; DAC register unchanged. 13-Bit DAC Data 0 0
0
1
0
Update DAC register from input register; exit shutdown. XXXXXXXXXXXXX 0 1
1
1
0 Simultaneously load input and DAC registers; exit shutdown. 13-Bit DAC Data 0
UPO goes low (default). XXXXXXXXXXXXX 1 0
0
0
1
Mode 1; DOUT clocked out on SCLK’s rising edge. 1XXXXXXXXXXXX 1 1
1
1
0 UPO goes high. XXXXXXXXXXXXX 1
No operation. XXXXXXXXXXXXX 0
16-BIT SERIAL WORD
Shutdown DAC (provided PDL = 1). XXXXXXXXXXXXX 1
Mode 0; DOUT clocked out on SCLK’s falling edge (default). 00XXXXXXXXXXX 1 1 1
C1 C0 C2
FUNCTION
D12 ............... D0
Table 1. Serial-Interface Programming Commands
X = Don’t care
DIN
SCLK
CS
MOSI
SCK
I/O
SPI/QSPI
PORT
(PIC16/PIC17)
SS
V DD
CPOL = 0, CPHA = 0
(CHE = 1, CKP = 0, SMP = 0,
SSPM3–SSPM0 = 0001) ( ): PIC16/PIC17 ONLY
MAX5130
MAX5131
Figure 4. SPI/QSPI Interface Connections (PIC16/PIC17)
DIN
SCLK
CS
SK
SO
I/O
MICROWIRE
PORT MAX5130
MAX5131
Figure 5. MICROWIRE Interface Connections