FreeCalypso > hg > freecalypso-docs
comparison FC-handset-spec @ 76:04080501911d
FC-handset-spec section 1.12.2.2: more accurate rounding to 41 uA
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Fri, 17 Sep 2021 18:35:37 +0000 |
| parents | c458b7159fbd |
| children | da3bb12c2e6f |
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| 75:c458b7159fbd | 76:04080501911d |
|---|---|
| 970 | 970 |
| 971 One downside of having pull-ups to VBAT (which can be as high as 4.2 V) on | 971 One downside of having pull-ups to VBAT (which can be as high as 4.2 V) on |
| 972 signals that are output from a 3.3V-powered buffer is that when the buffer | 972 signals that are output from a 3.3V-powered buffer is that when the buffer |
| 973 output is high, there may be current flowing into that high output (not sourcing | 973 output is high, there may be current flowing into that high output (not sourcing |
| 974 out of it as normally expected), which is a bad condition for CMOS outputs. | 974 out of it as normally expected), which is a bad condition for CMOS outputs. |
| 975 However, this current will be limited to a maximum of about 40 uA | 975 However, this current will be limited to a maximum of about 41 uA |
| 976 ((4.2-3.3 V) / 22 kOhm), and my feeling is that such small current won't hurt | 976 ((4.2-3.3 V) / 22 kOhm), and my feeling is that such small current won't hurt |
| 977 Nexperia LVC buffers. | 977 Nexperia LVC buffers. |
| 978 | 978 |
| 979 1.12.2.2.1. Signal pull-up/down directions | 979 1.12.2.2.1. Signal pull-up/down directions |
| 980 | 980 |