SMR101

Preliminary Information

Summit Microelectronics, Inc

209

1 2.1 4/21/2005

3

8 KHz

Ring

Oscillator,

+/-10%

accurate

Programmable Delay Generator/

Logic

Up Count

MSB

Programmable

Hold-Down Time,

0.125 to 40 Sec

VDD

GND

User Reset

Pushbutton

-

+

Vref

Glitch Filter

Reset Input

RESET _IN#

HARD_RST#

SOFT_RST#

2.7V_5.5V

SOFT_RST at

2.30V-4.5V

100k

100k

100k

PROG

Figure 3 – SMR101 Internal Block Diagram.

Pushbutton Input delay (seconds)

Voltage Monitor Threshold (V)

RESET Timeout Period (ms)

Register

Value

HARD_RST#

Register

Value

SOFT_RST#

Register Value

Voltage

Register Value

Time

000

0.5

000

0.125

000

4.50

00

1

001

1

001

0.25

001

4.25

01

25

010

2

010

0.5

010

2.97

10

100

011

4

011

1

011

2.81

11

200

100

8

100

2

100

2.70

101

16

101

4

101

2.55

110

32

110

8

110

2.43

111

40

111

10

111

2.30

Figure 4 – SMR101 Register Maps. The SMR101 is user programmable using the SMX3199 Programmer and the

SMR101 Windows GUI.

INTERNAL BLOCK DIAGRAM