PXD20 Datasheet, PDF (66/130 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Electrical characteristics
Table 11. Recommended operating conditions (5.0 V) (continued)
Symbol C
Parameter
Conditions
Value
Min
Max
Unit SpecID
V_DDM SR P Voltage on VDDMA (stepper motor supply)
pin with respect to ground (V_SSMA)
V_{DD_DR11}
P Voltage on V_{DD_DR} with respect to V_SS
V_{SS_DR}
D Voltage on V_SSRSDS with respect to V_SS
V_RSDS
TV_DD
P Voltage on V_{DD_DR} with respect to V_SS
SR D V_DD slope to ensure correct power up¹²
T_A SR P Ambient temperature under bias
+4.5
+1.62
+1.62
+3.0
–40
–40
+5.5
+3.6
+3.6
+3.6
12
105
105
V D2.30
V
V
V
V/ms
°C
D2.31
D2.32
D2.33
D2.34
D2.35
T_J SR D Junction temperature under bias
–40
140
D2.36
1 _{100 nF capacitance needs to be provided between VDDA/VSSA pair.}
2 _{Full functionality cannot be guaranteed when voltage drops below 4.5 V. In particular, I/O DC and ADC electrical characteristics}
may not be guaranteed below 4.5 V during the voltage drop sequence.
3 _{10 F capacitance must be connected between VDDR and VSS12. It is recommended that this cap should be placed, as close}
as possible to the DUT pin on board.
4 _{VDD12 cannot be used to drive any external component.}
5 _{Each VDD12/VSS12 supply pair should have a 10 F capacitor. Absolute combined maximum capacitance is 40 F. Preferably,}
all the VDD12 supply pads should be shorted and then connected to a 410 F capacitance. This is to ensure the ESR of
external capacitance does not exceed 0.2 . A 100 nF capacitor must be placed close to the pin.
6 _{VDD refers collectively to I/O voltage supplies, i.e., VDDE_A, VDDE_B, VDDE_DR, VDDMA, VDDMB and VDDMC. VDDmin value for}
is 4.5 V for VDDE_A & VDDM, 3 V VDDE_B, while it is 1.62 V for VDD_DR. VDD max value is 5.5 V for VDDE_A & VDDM
and 3.6 V for VDDE_B & VDD_DR.
7 _{100 nF capacitance needs to be provided between each VDD/VSS pair.}
8 _{VSS refers collectively to I/O voltage supply grounds, i.e., VSSE_A, VSSE_B, VSSE_A, VSSE_E, VSSMA, VSSMB and VSSMC) unless}
otherwise noted.
9 _{VDDE_A should not be less than VDDA.}
10 _{VDDE_B cannot go beyond 3.6V under any operating condition.}
11 _{VDD_DR can be 1.8, 2.5 and 3.3V (typical) based on type of SDR memory.}
12 _{Guaranteed by device validation}
4.5 Thermal characteristics
Table 12. Thermal characteristics for 176-pin LQFP¹
Symbol
R_JA
CC
R_JA
CC
R_JMA
CC
R_JMA
CC
R_JB
CC
R_JCtop
CC
C
Parameter
D Junction to Ambient Natural Convection²
D Junction to Ambient Natural Convection²
D Junction to Ambient²
D Junction to Ambient²
D Junction to Board³
D Junction to Case (Top)⁴
Conditions
Single layer board –1s
Four layer board –2s2p
@200 ft./min., single layer
board –1s
@200 ft./min., Four layer
board –2s2p
Value
36
29
28
23
18
5
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
SpecID
D3.1
D3.2
D3.3
D3.4
D3.5
D3.6
PXD20 Microcontroller Data Sheet, Rev. 2
66
Preliminary—Subject to Change Without Notice
Freescale Semiconductor