ds1075 ETC-unknow, ds1075 Datasheet - Page 9

• Manufacturer Part Number: ds1075
• Description: Econoscillator/divider
• Manufacturer: ETC-unknow

Figure 10
PROGRAMMING
Normally when power is applied to the supply voltage
pin the device will enter its normal operating mode fol-
lowing the power–on reset sequence. However the
device can be made to enter a programming mode if a
pull–up resistor is connected between IN/OUT and the
supply voltage pin, prior to power–up. The method used
Figure 11
Programming mode is entered by simply powering up
the DS1075 with a pull–up of approximately 5K . This
will pull the IN/OUT pin above V
ate the programming mode, causing the DS1075 to
internally release the IN/OUT pin (after t
the pullup resistor to pull the pin to the supply rail and
await the Master Tx Reset pulse (see diagram).
B) STANDARD TTL
A) OPEN DRAIN
RX
TX
BUS MASTER
BUS MASTER
TX
OUT0
RX
OUT
IH
V
OPEN DRAIN
PORT PIN
CC
TTL–EQUIVALENT
PORT PINS
on power–up and initi-
POR
t
por
), and allow
RX = RECEIVE
TX = TRANSMIT
t
stab
5K
VDD
5K
VDD
5K
for programming is a variant of the 1–Wire
used on a number of Dallas Semiconductor products.
HARDWARE
The hardware configuration is shown in the diagram. A
bus master is used to read and write data to the
DS1075’s internal registers. The bus master may have
either an open–drain or TTL–type architecture.
NOTE:
To ensure normal operation any external pull–up
applied to IN/OUT must be greater than 20K in value.
This will cause the IN/OUT pin to remain below V
power–up, resulting in normal operation at the end of
t
STAB
.
5 A
TYP.
DS1075 1–WIRE PORT
DATA
TO IN/OUT
OF DS1075
100
MOSFET
RX
TX
TM
101697 9/16
protocol
DS1075
IH
on