Verdin Carrier Board Design Guide
Preliminary
– Subject to Change
Toradex AG l Ebenaustrasse 10 l 6048 Horw l Switzerland l +41 41 500 48 00 l
l
Page | 77
Figure 62: Minimalistic Power Supply Reference Schematics
Please note that this circuit is not compliant with the USB specifications. An additional circuit is
required that detects whether the USB power source can deliver enough current and the system
does not exceed these limits. This can be achieved by a USB BC 1.2 detection IC or - in case of an
USB-C power source - a USB PD detection IC.
3.4.3
Single Cell Battery Power Approach
The wide input voltage range of the Verdin module allows it to run directly form a single cell Li-ion
battery. This makes it much easier to implement a rechargeable battery solution for the Verdin
module. When charging a regular Li-ion battery, the voltage rises to maximum 4.4V. The cell gets
damaged when it gets discharged below 2.5V. The Verdin module runs guaranteed down to a
minimum input voltage of 3.135V. Battery voltages falling between 3.135V and 2.5V represent a
capacity reserve that cannot be used up with Verdin modules. While this represents only a very
small portion of total battery capacity, it also helps to prevent battery deep discharge events from
happening.
POWER ON/OFF BUTTON (Optional)
RESET BUTTON (Optional)
1
2
3
4
SW3
TD-03XB
GND
1
2
3
4
SW1
TD-03XB
CTRL_RECOVERY_MICO#
246
CTRL_PWR_BTN_MICO#
248
CTRL_FORCE_OFF_MOCI#
250
CTRL_WAKE1_MICO#
252
CTRL_PWR_EN_MOCI
254
CTRL_SLEEP_MOCI#
256
CTRL_RESET_MOCI#
258
CTRL_RESET_MICO#
260
X1W
2309409-2
VCC
251
VCC
253
VCC
255
VCC
257
VCC
259
GND
11
GND
28
GND
39
GND
40
GND
50
GND
51
GND
68
GND
71
GND
83
GND
86
GND
89
GND
98
GND
109
GND
115
GND
122
GND
134
GND
146
GND
173
GND
204
GND
224
GND
236
GND
10
GND
18
GND
27
GND
33
GND
45
GND
65
GND
77
GND
97
GND
103
GND
110
GND
121
GND
127
GND
145
GND
158
GND
167
GND
170
GND
179
GND
182
GND
195
GND
194
GND
209
GND
223
GND
229
GND
230
GND
242
GND
243
VCC_BACKUP
249
X1K
2309409-2
GND
GND
GND
Place near SODIMM Pins 251 - 259
4.7uF
10V
C97
4.7uF
10V
C96
4.7uF
10V
C94
4.7uF
10V
C93
4.7uF
10V
C92
22uF
10V
C91
-> peripherals
GND
GND
1nF
2KV
C112
629105150521
VCC
1
D-
2
D+
3
ID
4
GND
5
S1
S3
S2
S4
X18
GND
1M
R67
ESD9101P2T5G
D24
GPIO_1
206
GPIO_2
208
GPIO_3
210
GPIO_4
212
PWR_1V8_MOCI
214
GPIO_5
216
GPIO_6
218
GPIO_7
220
GPIO_8
222
X1U
2309409-2
PWR_1V8_MOCI
-> peripherals
GND
100nF
16V
C110
Not USB Compliant
+V5_USB