33993 Datasheet, PDF (7/28 Pages) Freescale Semiconductor, Inc – Multiple Switch Detection Interface

ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Table 4. Dynamic Electrical Characteristics
Characteristics noted under conditions 3.1 V ≤ V_DD ≤ 5.25 V, 8.0 V ≤ V_PWR ≤ 16 V, -40°C ≤ T_C ≤ 125°C, unless otherwise
noted. Typical values noted reflect the approximate parameter means V_PWR = 13 V, T_A = 25°C under nominal conditions unless
otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
SWITCH INPUT
Pulse Wetting Current Time
Interrupt Delay Time
Normal Mode
t _{PULSE (ON)}
15
16
20
ms
t _INT-DLY
µs
–
5.0
16
Sleep Mode Switch Scan Time
Calibrated Scan Timer Accuracy
Sleep Mode
t _SCAN
100
200
300
µs
t _{SCAN TIMER}
–
%
–
10
Calibrated Interrupt Timer Accuracy
Sleep Mode
t _{INT TIMER}
–
%
–
10
DIGITAL INTERFACE TIMING ⁽¹¹⁾
Required Low State Duration on V_PWR for Reset ⁽¹²⁾
V_PWR ≤ 0.2 V
t _RESET
–
µs
–
10
Falling Edge of CS to Rising Edge of SCLK
Required Setup Time
t _LEAD
100
–
ns
–
Falling Edge of SCLK to Rising Edge of CS
Required Setup Time
t _LAG
50
–
ns
–
SI to Falling Edge of SCLK
Required Setup Time
t _{SI (SU)}
16
–
ns
–
Falling Edge of SCLK to SI
Required Hold Time
SI, CS, SCLK Signal Rise Time ⁽¹³⁾
SI, CS, SCLK Signal Fall Time ⁽¹³⁾
Time from Falling Edge of CS to SO Low Impedance ⁽¹⁴⁾
Time from Rising Edge of CS to SO High Impedance ⁽¹⁵⁾
Time from Rising Edge of SCLK to SO Data Valid ⁽¹⁶⁾
t _{SI (HOLD)}
20
–
ns
–
t _{R (SI)}
–
5.0
–
ns
t _{F (SI)}
–
5.0
–
ns
t _{SO (EN)}
–
–
55
ns
t _{SO (DIS)}
–
–
55
ns
t _VALID
–
25
55
ns
Notes
11. These parameters are guaranteed by design. Production test equipment uses a 4.16 MHz, 5.0 V SPI interface.
12. This parameter is guaranteed by design but not production tested.
13. Rise and Fall time of the incoming SI, CS, and SCLK signals are suggested for design considerations to prevent the occurrence of double
pulsing.
14. Time required for valid output status data to be available on SO pin.
15. Time required for output states data to be terminated at SO pin.
16. Time required to obtain valid data out from SO following the rise of SCLK with 200 pF load.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33993
7