DS1216 参数 Datasheet PDF下载

DS1216 SmartWatch RAM/SmartWatch ROM

Figure 2. Reset and Memory Density Options

NOTE:

THE LETTER SUFFIX OF THE SMARTWATCH IS LOCATED ON THE PC BOARD.

The

RST

pin on the controller has an internal pullup resistor. To disable the

RST

function, the trace

between pin 1 on the socket and pin 13 on the controller can be cut. In this case, the socket will ignore the

RST

input, preventing address transitions from resetting the pattern match, even if the

RST

bit is enabled.

On the DS1216B and DS1216D, the two V

CC

pins are connected together on the PC board. The switched

V

CC

from the controller is connected to the two V

CC

pins that connect to the inserted RAM. No

modifications are required if the lower density RAM is used. To use the higher density RAM, the trace by

the lower density RAM V

CC

pin, identified by a hash mark labeled “U,” must be cut. The two square-

metal pads, labeled “G,” must be shorted together. This disconnects switched V

CC

from the pin going to

the inserted RAM, and connects it to the corresponding address input pin for the higher density RAM.

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