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modules: power: Updating chg-iterm spec on documentation

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Most MOT batteries has 4.4V, but newer ones are 4.45V. Charging termination
current ("taper") is dependent on battery specification plus capacity testing
made by EE Team. So it can be something different than 97mA.

Change-Id: Idecf02dc8d7175ae803f093ca02164de8e6673d6
Signed-off-by: Cesar Santos <cmsantos@motorola.com>
Reviewed-on: https://gerrit.mot.com/1484667
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Tiago Ganselli <ganselli@motorola.com>
Reviewed-by: Ling Jin <lingjin@motorola.com>
Submit-Approved: Jira Key
This commit is contained in:
Cesar Santos 2020-01-16 16:27:49 -03:00 • committed by Cesar Augusto Marcelino dos Santos
commit 70214ca74d
1 changed files with 12 additions and 9 deletions
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21
drivers/power/qpnp-smbcharger-mmi/README
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@ -135,7 +135,9 @@ charging.
Current is always tapered when voltage achieves maximum voltage specification
(which is generally 4.4V, but may have a different value, depending a product
battery specs). It is tapered to 97mA, as IEEE specifies.
battery specs). It is tapered to some small value, possibly around 100mA,
which is based on product specifications and capacity testing, defined by
EE (Electrical Engineering) Team/Hardware.
If temperature is below -20 degC or above 60 degC, it should automatically
stop charging device.
@ -162,12 +164,12 @@ any commercial product that has a lithium-ion battery embedded or plugged to
it).
NOTE2: taper current mostly refers to when battery is above maximum allowed
voltage on a specific temperature region, based on rules above (which is 97mA
as current specification). So be aware that the rest of this document may
refer as "taper" to a current that is limiting the maximum value, but before
achieving a staget in which current is limited to 97mA (so an intermediate
stage). Also "taper voltage" will refer to a voltage level in which this
mentioned "taper" current (intermediate current level) is triggered.
voltage on a specific temperature region, based on rules above. So be aware
that the rest of this document may refer as "taper" to a current that is
limiting the maximum value, but before achieving a stage in which current
is limited to something around 100mA (so an intermediate stage). Also
"taper voltage" will refer to a voltage level in which this mentioned
"taper" current (intermediate current level) is triggered.
=========================================
@ -228,7 +230,7 @@ STEP_NONE: no charger present
STEP_STOP: in zone hot or zone cold, which limits charging considerably
STEP_NORM: limits current to some value
STEP_MAX: allows maximum current value, when in between 0 and 45 degC
STEP_FULL: battery is almost or completely full, tapering to 97mA
STEP_FULL: battery is almost or completely full, tapering to a small current
STEP_FLOAT: TODO
Important to note that even when moving from one state to another, temperature
@ -240,7 +242,8 @@ range device is.
sysfs).
"taper_ma" is "fcc_norm_ma" in case is in STATE_MAX, which means battery is
above taper voltage. If in any other state, it will refer to "chrg_iterm",
which is equal to 97mA as current standards.
which will depend on device specifications (4.4V batteries have 97mA as
current standards, and 4.45V batteries have 121mA as taper current).
Now, let's check the algorithms for a bit: