MC33993DWB Freescale Semiconductor, MC33993DWB Datasheet - Page 13

• Manufacturer Part Number: MC33993DWB
• Description: IC SWITCH I/O INTERFACE 32-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MC33993DWB

• Applications: *
• Interface: *
• Voltage - Supply: *
• Package / Case: 32-SOIC (7.5mm Width)
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

PROGRAMMABLE SWITCH REGISTER
battery or switch-to-ground. These inputs types are defined
using the settings command (refer to
input for switch-to-battery, a logic [1] for the appropriate bit
must be set. To set an SPn input for switch-to-ground, a logic
[0] for the appropriate bit must be set. The MCU may change
Table 5. Settings Command
WAKE-UP / INTERRUPT REGISTER
are allowed to wake the 33993 from Sleep mode or set the
INT pin low in Normal mode. Programming the wake-up /
generating an interrupt and will disable the specific input from
WETTING CURRENT REGISTER
and 2.0 mA (see
to set the switch contact current level (refer to
Programming the metallic bit to logic [0] will set the switch
wetting current to 2.0 mA. Programming the metallic bit to
logic [1] will set the switch contact wetting current to 16 mA.
The MCU may change or update the Wetting Current
Register via software at any time in Normal mode.
current during switch closure. The higher level of current is
designed to keep switch contacts from building up oxides that
form on the switch contact surface.
interrupt bit to logic [0] will disable the specific input from
Table 6. Wake-Up / Interrupt Command
Analog Integrated Circuit Device Data
Freescale Semiconductor
23
23
0
0
0
Inputs SP0 to SP7 may be programmable for switch-to-
The Wake-Up / Interrupt Register defines the inputs that
The 33993 has two levels of switch contact current, 16 mA
Wetting current is designed to provide higher levels of
Wake-Up /Interrupt Command
22
22
0
0
0
21
Settings Command
21
0
0
0
20
0
0
20
Figure
0
19
0
0
19
0
10). The metallic command is used
18
0
0
18
0
17
1
1
17
0
16
Table
0
1
16
1
LOGIC COMMANDS AND REGISTERS
15
X
X
5). To set an SPn
15
X
Table
14
X
X
14
X
sg1
13
X
3
7).
13
X
sg1
12
X
2
Not used
12
X
sg1
11
X
1
11
X
or update the Programmable Switch Register via software at
any time in Normal mode. Regardless of the setting, when the
SPn input switch is closed a logic [1] will be placed in the
Serial Output Response Register (refer to
page 17).
waking the IC in Sleep mode (refer to
the wake-up /interrupt bit to logic [1] will enable the specific
input to generate an interrupt with switch change of state and
will enable the specific input as wake-up. The MCU may
change or update the Wake-Up / Interrupt Register via
software at any time in Normal mode.
sg1
10
X
0
10
X
Figure 10. Contact Wetting and Sustain Current
sg9
X
9
X
9
Command Bits
Switch Contact Voltage
sg8
X
8
X
8
20 ms Wetting Current Timer
sp7
sg7
sp7 sp6 sp5 sp4 sp3 sp2 sp1 sp0
7
7
16 mA Switch Wetting Current
sp6
sg6
LOGIC COMMANDS AND REGISTERS
6
2.0 mA Switch Sustain Current
6
FUNCTIONAL DEVICE OPERATION
Battery/Ground Select
sp5
sg5
5
5
sp4
sg4
4
4
Table
sp3
sg3
3
3
Table
6). Programming
sp2
sg2
2
2
16,
sp1
sg1
1
1
33993
sp0
sg0
0
0
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