MCZ33993EW Freescale Semiconductor, MCZ33993EW Datasheet - Page 18

• Manufacturer Part Number: MCZ33993EW
• Description: IC MULTIPLE SWITCH DETECT 32SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MCZ33993EW

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

switch reads in Sleep mode. The period is set in the sleep
command and may be set to 000 (no period) to 111 (64 ms).
In Sleep mode when the scan timer expires, inputs will
behave as programmed prior to sleep command. The 33993
will wake up for approximately 125 µs and read the switch
inputs. At the end of the 125 µs, the input switch states are
compared with the switch state prior to sleep command.
When switch state changes are detected, an interrupt (when
enabled; refer to wake-up / interrupt command description on
page 13) is generated and the device enters Normal mode.
Without switch state changes, the 33993 will reset the scan
timer, inputs become tri-state, and the Sleep mode continues
until the scan timer expires again.
timer.
18
33993
Table 17. Sleep Command
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
23
Table 19. Scan Timer
Table 18. Interrupt Timer
0
The scan timer sets the polling period between input
Table 19
Bits 210
Bits 543
22
0
000
001
010
011
100
101
000
001
010
011
100
101
110
111
shows the programmable settings of the Scan
21
0
Sleep Command
20
0
19
1
18
1
Interrupt Period
Scan Period
17
0
No Scan
128 ms
256 ms
512 ms
1.024 s
2.048 s
4.096 s
1.0 ms
2.0 ms
4.0 ms
8.0 ms
32 ms
64 ms
16 ms
16
0
15
X
14
X
13
X
12
X
11
X
Normal mode.
33993 device exits Sleep mode and enters Normal mode.
Notice that the device will exit Sleep mode when the interrupt
timer expires or when a switch change of state occurs. The
falling edge of INT triggers the MCU to wake from Sleep
state.
Sleep mode. During the 125 µs, the device is fully active and
switch states are read. The quiescent current is calculated by
integrating the normal running current over scan period plus
approximately 60 µA.
TEMPERATURE MONITOR
programmed with the wetting current timers disabled,
considerable power will be dissipated by the IC. For this
reason temperature monitoring has been implemented. The
temperature monitor is active in the Normal mode only. When
the IC temperature is above the thermal limit, the temperature
monitor will do all of the following:
Table 19. Scan Timer
Note The interrupt and scan timers are disabled in the
Figure
With multiple switch inputs closed and the device
10
X
Figure 11
Bits 210
110
111
Inputs active for 125 us
Inputs active for 125 us
Inputs active for 125 us
out of 32 ms
out of 32 ms
out of 32 ms
9
X
5, page 8, is a graphical description of how the
Inputs active for
125 µs out of 32 ms
Command Bits
Figure 11. Sleep Current Waveform
X
8
illustrates the current consumed during
I=V/R or 0.270 V/100 Ω=2.7 mA
I=V/R or 0.270V/100ohm = 2.7mA
I=V/R or 0.270V/100ohm = 2.7mA
I=V/R or 0.270V/100ohm = 2.7mA
X
7
Analog Integrated Circuit Device Data
X
6
5
6.0 mV/100 Ω=60 µA
I=V/R or
I=V/R or 6mV/100ohm = 60 uA
I=V/R or 6mV/100ohm = 60 uA
I=V/R or 6mV/100ohm = 60 uA
Scan Period
Freescale Semiconductor
4
32 ms
64 ms
3
2
1
0